My GC library hasn't grown because I can't find a good price for Baten Kaitos Origins, Gauntlet, or the handful of rare games that interest me. (Also regret selling Killer 7 and would re-buy if I could find a decent price.) Currently sitting at 53 games and feel like that's enough - might even cut down a bit and dump the Splinter Cell games.
One game that was recently added to my wishlist is Zelda: Twilight Princess. Solid game, but damn.. those Wii waggle controls are garbage and have a really negative effect on the game as a whole. Despite really liking the ability to use a pointer for hookshot/arrows I'd gladly trade my Wii copy for a GameCube version to get rid of that pointless and horribly inaccurate waggle.

