Nintendo DS
Boogie (Weird dancing/music game, but fun, and the 20 tracks are all pretty good stuff.)
Carnival Games
Disney-Pixar's Up (Adventure is out there, yo!)
Fighting Fantasy: The Warlock of Firetop Mountain (1st person action RPG based on the old choose-your-adventure book!)
Final Fantasy Fables: Chocobo's Tale (Final Fantasy meets WarioWare.)
Guitar Rock Tour (Only 15 tracks but a pretty good Guitar Hero copycat.)
LEGO Pirates of the Caribbean
Paws & Claws Pet Vet: Australian Adventures (I don't care what ya'll think, I like saving and treating baby koalas, wombats, and kangaroos.)
Planet Puzzle League (Tetris Attack with a different name--tons of different gameplay modes too.)
Red Bull BC One (Kind of a bizarre game where you break dance by connecting dots to make closed polygons on the touch screen--more engrossing/challenging than it sounds.)
PC
Klondike & Freecell Solitaire