I looove the Konami Sports games on FDS. Some made it to the NES (Exciting Basket became Double Dribble) but were re-done and are missing the awesome FDS music during games!
Here's the full list of Konami Famicom Disk System games.
I have the complete set.
Ai Senshi Nicol - 10/10 game with amazing music
Arumana no Kiseki - 10/10 game with amazing music
Falsion - awesome shooter
Meikyuu Jiin Dababa - Awesome puzzle platformer with amazing music
Gyruss - much better music than the cart version
Bio Miracle Bokutte Upa - much better music than the cart version
Akumajo Dracula - Castlevania with saving
Moreo Twinbee - released in modified without three player support as Stinger
Smash Ping Pong (published by Nintendo) - very cool ping pong arcade game
Dracula 2 - Castlevania II with higher quality music but very frustrating load times!
Doremikko - music game that comes with a Keyboard
Esper Dream - Japanese RPG
Naze no Kabe - Awesome expansion on the Arkanoid formula, releaed as Crackout in PAL
Risa no Yōsei Densetsu - Japanese 'dating adventure'
Final Command: Red Fortress - was released in expanded form as Jackal - completely different levels here though, I think of it as a prequel.
Exciting Baseball - pretty good, cool music
Exciting Billiards - pretty good, cool music
Exciting Soccer - fantastic soccer game. Best of 8-bit.
Konami Tennis - really great tennis game. Best of 8-bit except Game Boy Tennis.
Konami Ice Hockey - Blades of Steel - basically the same as cart version
Green Beret - Rush'n Attack, same as cart version
The Goonies - Disk Writer only - same as cart
TwinBee - Disk Writer only - same as cart