Some GBA impressions would be cool, so yeah go for it. Samurai Kid for the GBC actually looks pretty fun, and seems import friendly too.
Edit: and please add the GBA list Gameboy415!
I meant to post last weekend but I got a bit busy - sorry about the wait!
JP GBA recommendations:
Bit Generations series - 7 extremely simple yet extremely fun and addicting games from Nintendo. Many have been re-released as WiiWare/DSiWare.
Densetsu No Stafi 1-3 - the prequels to "The Legendary Starfy" on DS. All 3 are excellent 2D games that blend fun underwater segments with typical platforming stages. Plus, Stafi 3 has an amazing cameo from a famous Nintendo character-
!
F-Zero Climax - JP only sequel to the GBA F-Zero games.
Guru Logic Champ - outstanding puzzle game from Compile in which you complete images by firing blocks at a rotating stage. (precursor to Snapdots on DSiWare)
Hudson Best Collection Volume 6: Takahashi Meijin Collection - collects all
4 Adventure Island games on one GBA cart including the JP-only 4th game!
Klonoa Heroes - JP-only action-RPG featuring characters from the Klonoa franchise.
Kuru Kuru Kururin - very fun action-puzzle game in which you guide a rotating ship through mazes (also released in Europe).
Kuru Kuru Paradise - JP only sequel to Kuru Kuru Kururin
Mother 1 + 2 - JP only prequel to Earthbound & Earthbound on one GBA cart.
Mother 3 - JP only sequel to Earthbound, pretty well-known already.
Rhythm Tengoku - first game in the "Rhtyhm Heaven" franchise featuring much tighter gameplay and quirky stages/music from the WarioWare team.
Shin Bokura no Taiyō: Gyakushū no Sabata - third game in the Boktai series.
Slime no Mori Mori Dragon Quest - prequel to Rocket Slime on DS. It's a very fun Zelda-esque action RPG. (most of the content is recycled in Rocket Slime though)
Super Mario Advance 4: Super Mario Bros 3 - unlike the US/Euro releases, the JP version was supplemented by a
much larger set of e-cards that allow you to unlock several brand-new stages! (requires game cart, e-reader, and e-cards)
Also, I recently realized I haven't posted my Game Boy collection in this thread yet!
These pics are from last year and don't include some of the newer stuff I've picked up but it's still the majority of my GB collection.
I actually have the boxes for most of the GBA stuff, almost all of the JP stuff, and a good portion of the GB/GBC games but it was easier to just take pics of the carts.
Game Boy systems:
Game Boy Games:
GB-GBC Games:
GBC Games:
GBA Games: