* Wario Touched (Nintendo DS): Very fun minigames. It might take a while for you to figure out what's giong on, and when you do it could be too late. The minigames are quite fun to play, specially those spoofing old nintendo games. I don't know the re-play factor for this game, it might get old after you did all the minigames...
* Wario Twisted (Game Boy Advanced): As above, but EXTRA fun. The gyroscope works great, and gives a feeling feedback to the user like the rumble pack did. The mini games are also quite fun, and guaranteed to make you laugh. If asked to chose between the two "warios", I'd probably choose Twisted.
* Meteos (Nintendo DS): A somewhat confusing but creative puzzle game in which you must align columns horizontally moving them only vertically, and thus sending them as rockets to the enemy. It didn't seem to be that much fun, but I could be wrong...
* Ridge Racer DS (Nintendo DS): I've played only the multiplayer version, and it seemd kinda buggy, alghough fun. Of course, these early games might have some problems with multiplayer, but not letting the racer use it's username as the name onscreen is ridiculous. The controllers are good and respond actually well. I haven't played the single player version, so I can't tell how good the game actually is, but the multiplayer version is actually quite fun, if you have enough people to play.
* Puyo Pop Fever (Nintendo DS): By SEGA. I own this one. It's a puzzle game similar to tetris or shapes and columns, but with focus over the "combat" mode. It's more complex than it seems, and although it gets "too cute" sometimes, it looks and sounds great. The multiplayer mode is fun, but if one player is better than the others, the whole game is ruined (you can set up a handicap). It's one of my favorite games, and is HIGLHY addictive...
I'll add more reviews later.