DS games:

Etrian Odyssey 1 and 2
Castlevania: Dawn of Sorrow
FFTA2: Grimoire of the Rift
Final Fantasy 3
Golden Sun Dark Dawn
Glory of Heracles
Brain Age 1 and 2
Big Brain Academy
Dragon Quest 6: Realms of Revelation

got some genesis games today at a thrift store

Midnight Resistance
Thunder Fox
Rambo III
Shadow of the Beast II

PSP, buy 2 get 1 free:

Mana Khemia: Student Alliance
Final Fantasy Tactics: War of the Lions
Dissidia Final Fantasy

PS3 Games:

Dragon Age Origins Ultimate Edition
Crysis 2 Limited Edition
Narnia Prince Caspian
Ninja Gaiden Sigma

Well, it's July, but I bought this a couple weeks back, in June.

Gamecube: Final Fantasy Crystal Chronicles.

I've been wanting to try this game out for awhile. It is suppose to kind of be like the old game gauntlet, although more of an RPG, but the big draw for Nintendo was to try to use the GBA as a controller for the game, when played in multiplayer.

There were a lot of games that had some type of usage of the GBA link-up cable. Some, like Phantasy Star Online, used it for mini games. Some games used it for extra items, or to unlock extra locations. One of the things Nintendo really tried to sell the system as was for football games, where you could secretly select plays on your gba where none of the other players could see it. It's not something I've used much personally, but here is a link to compatible games:

GBA/GC Link-up Compatible Games

Yep, there was also Metroid Prime's abilitiy to link to Metroid Fusion.

If you complete Fusion for GBA all the way through and link it to GameCube, you will unlock the NES Metroid.

For some reason, Nintendo wasn't satisfied with that, so they released Zero Mission, which played somewhat like the NES Metroid, but it looked better.

Don't forget Zelda Four Swords when you put the Link to the Past GBAs together.