I will never understand these people that go out and buy a $300+ piece of hardware without knowing anything about it. Never.
Anyway, get a HDMI cable if you have a HD set. Go buy Motorstorm: Pacific Rift for your offroad racing fix, pick up both Resistance games for your FPS fix, get Valkyria Chronicles if you're looking for a unique strategy-RPG hybrid, get MGS4 if you're a fan of the series and/or would like a good third-person stealth-action title, purchase Ratchet & Clank: Future for some platformer goodness, and pick up Uncharted if you're looking for a good adventury third-person shooter. Also, LBP is almost a given.
There's also quite a bit of cool downloadable titles off of PSN, but I haven't really looked into those too much.