I bought a Playstation 3, Now all i need are some good games.

[Phoenix Gamma]

If you're into strategy RPGs, Valkyria Chronicles is probably one of the best in the genre over the past few years.

MGS4 is really good if you've been keeping up with the story.

Also, check out PSN. Flower, Noby Noby Boy, and the Pixeljunk games are all really good.