As for Namco Museum...
US Released Titles
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PSX - All collections have prerendered lobby areas to explore and various extras for at least some of the games. Games not previously released in English have been translated.
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Namco Museum Vol. 1 - Pac-Man, Galaga, Pole Position, Bosconian, Rally-X, New Rally-X, Toy Pop
Namco Museum Vol. 2 - Xevious, Gaplus, Super Pac-Man, Mappy, Grobda, Dragon Buster
Namco Museum Vol. 3 - Dig Dug, Phozon, Ms. Pac-Man, Galaxian, Pole Position II, The Tower of Druaga (only one of the PSX series to get a Greatest Hits re-release in the US, and thus far more common than the other four here)
Namco Museum Vol. 4 - Assault, Pac-Land, Ordyne, The Return of Ishtar (not previously released in the US I think), The Genji and the Heiki Clans (Genpei Toumaden in Japan, not previously released in the US)
Namco Museum Vol. 5 - The Legend of Valkyrie (not previously released in the US or in English), Metro-Cross, Baraduke, Dragon Spirit, Pac-Mania
Also, Xevious 3D/G+ included, in addition to the new title Xevious 3D/G, Xevious, Super Xevious, and Xevious Arrangement.
N64/Dreamcast (nearly identical on both platforms)
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Namco Museum 64 (N64) / Namco Museum (DC) - Pac-Man, Ms. Pac-Man, Galaga, Galaxian, Pole Position, Dig Dug. These releases have no extras, unlike the PSX collections. The only difference between these two versions is that the Dreamcast version contains the exclusive VMU minigame "PACit".
Game Boy Advance
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Namco Museum - Ms. Pac-Man, Galaga, Galaxian, Pole Position, Dig Dug. No extras.
Namco Museum 50th Anniversary - Pac-Man, Ms. Pac-Man, Galaga, Dig Dug, Rally-X.
Pac-Man Collection - Pac-Man, Ms. Pac-Man, Pac-Mania, Pac-Man Arrangement (1996 arcade title, not the PS2/Xbox/GC Namco Museum one)
Gamecube/Xbox/PS2 (they are the same on all three)
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Namco Museum - Pac-Man, Ms. Pac-Man, Dig Dug, Pole Position, Pole Position II, Galaxian, Galaga, Pac-Attack (unlockable, SNES port not arcade), Pac-Mania (unlockable), Galaga Arrangement, Pac-Man Arrangement, and Dig Dug Arrangement (the latter three are from the 1995-1996 arcade Namco Classic Collection titles). Contains no extras except for borders based on the original arcade cabinets for vertical-monitor titles.
Namco Museum 50th Anniversary - Bosconian, Dig Dug, Dragon Spirit, Galaxian, Galaga, Mappy, Pac-Man, Ms. Pac-Man, Pole Position, Pole Position II, Rally-X, Rolling Thunder, Sky Kid, Xevious, Galaga '88 (unlockable), Pac-Mania (unlockable). No extras worth mentioning - vertical monitor games have black borders. Also on PC.
DS
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Namco Museum DS - Pac-Man, Galaga, Xevious, Super Xevious, Galaxian, Mappy, The Tower of Druaga, Dig Dug II (older and newer versions), Pac-Man Vs. (ported from the Gamecube, multiplayer only)
PSP
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Namco Museum Battle Collection - Pac-Man, Ms. Pac-Man, Dig-Dug, Rally-X, New Rally-X, Galaga, Galaxian, King and Balloon, Bosconian, Xevious, Tower of Druaga, Dragon Buster, Grobda, Motos, Dig Dug II, Rolling Thunder, Mappy, and completely new remix titles Pac-Man Arrangement, Galaga Arrangement, Dig Dug Arrangement, and New Rally-X Arrangement (these are not ports of the 1995-6 games as with the PS2/Xbox/GC Namco Museum collection, but are new remakes from 2005)
Wii
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Namco Museum Remix - Galaxian, Pac & Pal, Cutie-Q, Mappy, Dig Dug, Super Pac-Man, Gaplus, Pac-Mania, and five new "remix" titles: Pac'n Roll Remix, Rally-X Remix, Galaga Remix (not the same as Galaga Arrangement, this is a new version), Gator Panic Remix, Pac-Motos.
Virtual Console Arcade titles (downloadable in the Wii shop's Virtual Console Arcade section) - Mappy, Gaplus, The Tower of Druaga
Xbox 360
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Live Arcade titles: Dig Dug, Galaga, Ms. Pac-Man, New Rally-X, Pac-Man, Xevious, and the new titles Galaga Legions, Pac-Man Championship Edition, and Mr. Driller Online
Namco Museum Virtual Arcade: All of the above titles plus: Baraduke, Bosconian, Dig Dug II, Dragon Buster, Dragon Spirit, Galaga '88, Galaxian, Grobda, King & Balloon, Mappy, Metro-Cross, Motos, Pac & Pal, Pac-Mania, Pole Position, Pole Position II, Rally-X, Rolling Thunder, Sky Kid, Sky Kid Deluxe, Super Pac-Man, The Tower of Druaga, and the 2005 PSP versions of Dig Dug Arrangement, Galaga Arrangement, and Pac-Man Arrangement. Minimal extras. No multiplayer in any titles except for online-only play in some Live Arcade titles.
PS3
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Namco Museum Essentials (for download on Playstation Network only, not on disc) - Pac-Man, Dig Dug, Galaga, Xevious, Dragon Spirit, and the new game Xevious Resurrection.
Arcades
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Ms. Pac-Man / Galaga (Pac-Man is in it, but hidden)
Japan Only
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Playstation
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Namco Museum Encore - Dragon Saber, Wonder Momo, Rompers, Motos, Sky Kid, King and Balloon, Rolling Thunder
PSP
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Namco Museum - Pac-Man, Ms. Pac-Man, Dig Dug, Rally-X, New Rally-X, Galaga, Galaxian, remix titles Pac-Man Arrangement, Galaga Arrangement, Dig-Dug Arrangement from the PS2/Xbox/GC collection, and the new remix title New Rally-X Arrangement.
Namco Museum Vol. 2 - King and Balloon, Bosconian, Xevious, Tower of Druaga, Dragon Buster, Grobda, Motos, Dig Dug II, Rolling Thunder, Mappy, Dragon Spirit, and new remix titles Motos Arrangement, Pac-Man Arrangement Plus (new version). Everything from both JP PSP collections except for Dragon Spirit is in the US PSP Namco Museum Battle Collection, except in one collection instead of two.
Wii
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Virtual Console Arcade titles (downloadable in the Wii shop's Virtual Console Arcade section) - New Rally-X, Galaga, Bosconian, Toy Pop, Xevious, Grobga, Dragon Buster, Galaxian, Dig Dug, The Return of Ishtar, The Genji and the Heiki Clans, Assault, Ordyne, Pac-Mania, The Legend of Valkyrie, Baraduke, Dragon Spirit, Sky Kid, Rolling Thunder, Galaga '88, Dig Dug II.
Arcades
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Namco Classic Collection Vol. 1 - Mappy, Galaga, Xevious, Super Xevious, and new titles Mappy Arrangement, Xevious Arrangement, Galaga Arrangement. Galaga Arrangement and Xevious Arragement have home ports in collections, but Mappy Arrangement does not.
Namco Classic Collection Vol. 2 - Pac-Man, Rally-X, Dig Dug, Pac-Man Arrangement, Rally-X Arrangement, Dig Dug Arrangement. All three have home ports in collections.