StarWars Knights of the Old Republic is incredibly well done. I couldn't turn off the console when I got that game. Though, there's not a great deal of replay value. couple three times through the game and it starts getting repetitive. but, still very pretty and highly cool.
I got tetris worlds for free, and that's a pretty fun game as well. great after a long day and you just want some mind numbing alpha pattern reaction game so you can sleep. music's good too.
I'm debating whether I wanna get Fable (if it's ever released). It seems cool, but the hype I've seen would be very nearly impossible for the game to actually live up to.
my wife wants me to get Barbie Horse adventures. :) she likes horses. I like swords.