In your opinion, what was the best game of 2008(or worded better, what was your favorite game of 08)? I would choose Chrono Trigger DS. I know it is a remake(I played the original), but the game was just as entertaining playing it again as was the first time I picked it up. Nothing was taken out, but things were added into it(videoclips, a new ending [rumor], a new dungeon, and a monster trainer). Square-Enix made a good move by remaking it. Now, if only they would do that with some of their othe backtitled games(Seiken Denetsu 3, Chrono Cross, Parasite Eve series, Xenogears, etc).
If it was an original IP, then I would say LittleBigPlanet. It used the PS3 in a way that no one(at the time) thought about using it as. You would expect a game like that on the PC.