Many sites have their review copies. Will do my best to link to new footage from around the world wide web.
Edit: Rounding up video reviews now. Some may not be in English.
VIDEO REVIEWS
IGN
GameXplain
Nintendo World Report
GamesRadar
Tealgamemaster
Castle Couch
3killabytes
Trailer Drake
3DJuegos.com
PC Games
Random Highlight
Jeremy Parish of USGAMER
The Daily Mario: Day 1 With Super Mario Maker
Super Mario Maker | The Daily Mario #02: The Playtest's the Thing
The Daily Mario: Day 3 With Super Mario Maker | Sea-nanigans
The Daily Mario: Day 4 With Super Mario Maker | The Castle Indoctrination
The Daily Mario: Day 5 with Super Mario Maker | I'll Be Dammed
The Daily Mario: Day 6 With Super Mario Maker | Back to Basics
The Daily Mario: Day 7 With Super Mario Maker | "And on the Seventh Day..."
The Daily Mario: Day 8 With Super Mario Maker | A Work in Progress
VolatileGabe
Super Mario Maker Walkthrough Part 1 - Trying Some Levels! Let's Play Gameplay
Super Mario Maker Part 2 - Super Metroid Maker?!
Super Mario Maker Part 3 - 10 Mario Challenge!
GameXplain:
Super Mario Maker - Customizing Bowser & Bowser Jr Boss Fights
Cool Bits - Super Mario Maker's SMB3 White Block Secret
Super Mario Maker Q&A: 60 MORE of YOUR Questions Answered! (Part 2)
Metroid U in Super Mario Maker (Custom Stage)
Super Shmup Bros in Super Mario Maker (+Flying Bowser Jr. Boss) (8/20)
Super Mario Maker Q&A: 50 of YOUR Questions Answered!
Super Mario Maker - All 11 Cursors (Cat Paws, Mario Gloves, & more!) (8/19)
What controllers work in Super Mario Maker? Q&A Announcement (8/19)
Super Mario Maker - All 7 Start-Up Title Screen Openings (8/19)
Super Mario Maker - All Game Styles & Level Themes + Creator Music (Airships, Ghost Houses, & more!) (8/19)
1-Hour of Super Mario Maker Gameplay (Livestream Archive) (8/18)
Super Mario Maker - All 60 Objects in all 4 Game Styles Comparison (Enemies, Items, & Power-Ups!) (8/18)
Super Mario Maker - Secret Mario Paint Fly Swatting Game! (Easter Eggs) (8/18)
Super Mario Maker - All Sound FX & Alt. Versions (8/18)
amiibo in Super Mario Maker - Donkey Kong, Peach, Kirby, Yoshi, Luigi, & more (8/18)
Super Mario Maker - 11 Title Screen Secrets (Easter Eggs) (8/18)
Super Mario Maker - 10 Mario Challenge Gameplay (Story Mode) (8/18)
ScrewAttack
Super Mario Maker HANDS ON! - Special Stream
Nintendo World Report:
2 Hours of Super Mario Maker Live Stream (NWR)
Super Mario Maker - 5-3 Remix (Shoe Goombas)
Super Mario Maker - 8-4 Remix (Castle Labyrinth)
Super Mario Maker - 1-2 Remix (Underground)
Super Mario Maker - There Has To Be A Better Way!! (8/19)
Super Mario Maker: More Classic Levels Return (8/18)
Super Mario Maker: Classic Levels Return 1-1 Remix (8/18)
Super Mario Maker - Switch It Up! (8/18)
Super Mario Maker - Sunken Mario (8/18)
Super Mario Maker - Unlocking Fun with amiibo (8/18)
Super Mario Maker - Opening First Time Playing (8/18)
Direct-Feed Gaming
Super Mario Maker - Expert Community Levels Gameplay Footage (Direct-Feed) August 28th
Super Mario Maker - Expert 100 Mario Challenge Wii U Footage (Direct-Feed) (8/19)
Super Mario Maker - 10 Mario Challenge (Direct-Feed Wii U) (8/18)
NintenDaan
[Super Mario Maker] Title Screen Gameplay (8/18)
[Super Mario Maker] Platforming Pickle Gameplay (8/18)
[Super Mario Maker] Effects Gameplay (8/18)
[Super Mario Maker] Course World Gameplay (8/18)
[Super Mario Maker] First Steps Gameplay (8/18)
[Super Mario Maker] Backgrounds Gameplay (8/18)
[Super Mario Maker] 100 Mario Challenge Gameplay (8/18)
[Super Mario Maker] 10 Mario Challenge Gameplay (8/18)
[Super Mario Maker] Amiibo Costumes Gameplay (8/18)
LETSPLAYmarkus
SUPER MARIO MAKER # 10 ★ LPM-Level, die Zweite! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 09 ★ Pre-Release Level aus aller Welt [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 08 ★ Meine allerersten, eigenen Level [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 07 ★ Frischer Wind an bekannten Orten! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 06 ★ Mode-Trend Panzerhelme! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 05 ★ Achterbahnfahrt der Gefühle! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 04 ★ Zieht einem ja die Schuhe aus! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 03 ★ Klasse Ideen und Innovationen! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 01 ★ 30th Super Mario Bros. Anniversary! [HD | 60fp
SUPER MARIO MAKER # 02 ★ 10-Mario-Herausforderung! [HD | 60fps
MidwestProfessor
Super Mario Maker #17 - Amiibos Wii Fit Trainer, Marth, and more! Plus Slippy Toad Unlock!
Super Mario Maker #6 - Pikachu has joined the battle
Super Mario Maker #11 - 8 levels, a few Pokemon, and Ashley
AbdallahSmash026
Super Mario Maker Preview Livestream - Let's Build Together! [YouTube Gaming]
KittyKatGaming
Super Mario Maker PREVIEW! Part 1!!! Watch me DIE a HUNDRED times!
TheBitBlock
Super Mario Maker - Airships in SMB & SMW
The Cabal
Super Mario Maker Troll Level Featured By Nintendo
Edit: Rounding up video reviews now. Some may not be in English.
VIDEO REVIEWS
IGN
GameXplain
Nintendo World Report
GamesRadar
Tealgamemaster
Castle Couch
3killabytes
Trailer Drake
3DJuegos.com
PC Games
Random Highlight
Jeremy Parish of USGAMER
The Daily Mario: Day 1 With Super Mario Maker
Super Mario Maker | The Daily Mario #02: The Playtest's the Thing
The Daily Mario: Day 3 With Super Mario Maker | Sea-nanigans
The Daily Mario: Day 4 With Super Mario Maker | The Castle Indoctrination
The Daily Mario: Day 5 with Super Mario Maker | I'll Be Dammed
The Daily Mario: Day 6 With Super Mario Maker | Back to Basics
The Daily Mario: Day 7 With Super Mario Maker | "And on the Seventh Day..."
The Daily Mario: Day 8 With Super Mario Maker | A Work in Progress
VolatileGabe
Super Mario Maker Walkthrough Part 1 - Trying Some Levels! Let's Play Gameplay
Super Mario Maker Part 2 - Super Metroid Maker?!
Super Mario Maker Part 3 - 10 Mario Challenge!
GameXplain:
Super Mario Maker - Customizing Bowser & Bowser Jr Boss Fights
Cool Bits - Super Mario Maker's SMB3 White Block Secret
Super Mario Maker Q&A: 60 MORE of YOUR Questions Answered! (Part 2)
Metroid U in Super Mario Maker (Custom Stage)
Super Shmup Bros in Super Mario Maker (+Flying Bowser Jr. Boss) (8/20)
Super Mario Maker Q&A: 50 of YOUR Questions Answered!
Super Mario Maker - All 11 Cursors (Cat Paws, Mario Gloves, & more!) (8/19)
What controllers work in Super Mario Maker? Q&A Announcement (8/19)
Super Mario Maker - All 7 Start-Up Title Screen Openings (8/19)
Super Mario Maker - All Game Styles & Level Themes + Creator Music (Airships, Ghost Houses, & more!) (8/19)
1-Hour of Super Mario Maker Gameplay (Livestream Archive) (8/18)
Super Mario Maker - All 60 Objects in all 4 Game Styles Comparison (Enemies, Items, & Power-Ups!) (8/18)
Super Mario Maker - Secret Mario Paint Fly Swatting Game! (Easter Eggs) (8/18)
Super Mario Maker - All Sound FX & Alt. Versions (8/18)
amiibo in Super Mario Maker - Donkey Kong, Peach, Kirby, Yoshi, Luigi, & more (8/18)
Super Mario Maker - 11 Title Screen Secrets (Easter Eggs) (8/18)
Super Mario Maker - 10 Mario Challenge Gameplay (Story Mode) (8/18)
ScrewAttack
Super Mario Maker HANDS ON! - Special Stream
Nintendo World Report:
2 Hours of Super Mario Maker Live Stream (NWR)
Super Mario Maker - 5-3 Remix (Shoe Goombas)
Super Mario Maker - 8-4 Remix (Castle Labyrinth)
Super Mario Maker - 1-2 Remix (Underground)
Super Mario Maker - There Has To Be A Better Way!! (8/19)
Super Mario Maker: More Classic Levels Return (8/18)
Super Mario Maker: Classic Levels Return 1-1 Remix (8/18)
Super Mario Maker - Switch It Up! (8/18)
Super Mario Maker - Sunken Mario (8/18)
Super Mario Maker - Unlocking Fun with amiibo (8/18)
Super Mario Maker - Opening First Time Playing (8/18)
Direct-Feed Gaming
Super Mario Maker - Expert Community Levels Gameplay Footage (Direct-Feed) August 28th
Super Mario Maker - Expert 100 Mario Challenge Wii U Footage (Direct-Feed) (8/19)
Super Mario Maker - 10 Mario Challenge (Direct-Feed Wii U) (8/18)
NintenDaan
[Super Mario Maker] Title Screen Gameplay (8/18)
[Super Mario Maker] Platforming Pickle Gameplay (8/18)
[Super Mario Maker] Effects Gameplay (8/18)
[Super Mario Maker] Course World Gameplay (8/18)
[Super Mario Maker] First Steps Gameplay (8/18)
[Super Mario Maker] Backgrounds Gameplay (8/18)
[Super Mario Maker] 100 Mario Challenge Gameplay (8/18)
[Super Mario Maker] 10 Mario Challenge Gameplay (8/18)
[Super Mario Maker] Amiibo Costumes Gameplay (8/18)
LETSPLAYmarkus
SUPER MARIO MAKER # 10 ★ LPM-Level, die Zweite! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 09 ★ Pre-Release Level aus aller Welt [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 08 ★ Meine allerersten, eigenen Level [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 07 ★ Frischer Wind an bekannten Orten! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 06 ★ Mode-Trend Panzerhelme! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 05 ★ Achterbahnfahrt der Gefühle! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 04 ★ Zieht einem ja die Schuhe aus! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 03 ★ Klasse Ideen und Innovationen! [HD | 60fps] Let's Play Super Mario Maker
SUPER MARIO MAKER # 01 ★ 30th Super Mario Bros. Anniversary! [HD | 60fp
SUPER MARIO MAKER # 02 ★ 10-Mario-Herausforderung! [HD | 60fps
MidwestProfessor
Super Mario Maker #17 - Amiibos Wii Fit Trainer, Marth, and more! Plus Slippy Toad Unlock!
Super Mario Maker #6 - Pikachu has joined the battle
Super Mario Maker #11 - 8 levels, a few Pokemon, and Ashley
AbdallahSmash026
Super Mario Maker Preview Livestream - Let's Build Together! [YouTube Gaming]
KittyKatGaming
Super Mario Maker PREVIEW! Part 1!!! Watch me DIE a HUNDRED times!
TheBitBlock
Super Mario Maker - Airships in SMB & SMW
The Cabal
Super Mario Maker Troll Level Featured By Nintendo
SUPER MARIO MAKER - SOUND EFFECTS TRAILER (JAPANESE)
https://youtu.be/dU5ekPLX4i0
IGN - SUPER MARIO MAKER: 11 MINUTES OF WACKY SOUND FX
https://youtu.be/HVC5FL2ZRf0
Game Maker's Toolkit released a Super Mario Maker video a couple hours ago.
Really great video on getting design ideas from the past games and creating an actual well designed Mario level. His level seems pretty fun.