Now that we've finally got a rarity list going, we've got a reference for this.
http://www.digitpress.com/lists/gameboy.pdf
So. What are the best original black and white Game Boy games ever? Discuss and we'll start the official list here.
Bionic Commando
Boxxle
Burgertime
Castlevania 2: Belmont's Revenge
Donkey Kong
Final Fantasy Adventure
Final Fantasy Legend
Final Fantasy Legend II
Final Fantasy Legend III
Fortified Zone
Game & Watch Gallery
Gargoyle's Quest
Harvest Moon
Kid Dracula
Kid Icarus: Of Myths and Monsters
Kirby's Adventure
Kirby's Dream Land
Kirby's Dream Land 2
Kirby's Star Stacker
Mario's Picross
Mega Man IV
Mega Man V
Metroid II: Return of Samus
Mole Mania
Motocross Maniacs
Operation C
Pokemon Red/Blue/Yellow
Revenge of the Gator
Samurai Shodown (probably the GB's best fighting game)
Super Mario Land
Super Mario Land 2: 6 Golden Coins
Super Mario Land 3: Wario Land
Super RC Pro-Am
Tetris
Tetris Attack
Wario Land 2
Zelda: Link's Awakening