Pokemon Red - This actually started off as an attempt to nuzlocke Crystal, and I decided to just see what all my old cartridges' save files had. Surprisingly, all of them were still intact, including my Silver file which I discovered had a nearly-complete Pokedex. All that was missing were Entei, Raikou, the Kanto legendary bird trio, and Celebi. After catching the two legendary dogs/cats/gerbils/whatever, I decided to start a Red nuzlocke instead and catch the three birds after completing it.
Nostalgia (DS) - I'd seen this game in the stores several times and I remember reading a review about it in Game Informer, so I decided to buy it with some leftover Christmas money. Not the greatest game, but it's not bad either. The story is about as cliched as you can get (young male goes on an adventure to find his famous father who has just gone missing after running into an unknown evil organization and saving a young woman who has amnesia and hidden mystical powers; your future party members include another orphaned young man who grew up in the slums and distrusts everybody and a loli witch from a nearly-extinct clan of magic-users) and doesn't play out very well, but the battle system is pretty good, if practically stolen from Final Fantasy X.
Pokemon White - I'm playing a regular run on a translated ROM, but a lot of the stuff that doesn't pertain to the main story or battles hasn't been translated and it's pissed me off to the point where I don't want to play anymore. Seriously, like half of the stuff in Raimon City hasn't been touched at all.
Donkey Kong Country Returns - Almost forgot to mention this game, but I've been playing this game since I got it for Christmas. I love it, but the perfectionist in me refuses to let a level go by without getting all the puzzle pieces. Which is not good, because those temple platform stages make me ragequit a LOT. Also, maybe it's just me, but the Invincibility Potion seems to totally break boss stages. I haven't gotten that far in the game, though, so perhaps it's just that the early bosses are really easy.