Oblivion rocks my world.

I mean, wow.  Easily the most amazing RPG experience I've ever had.  Highly recommended.

Other than Oblivion, I've been getting in a lot of the Xbox 360 version of Ghost Recon: Advanced Warfighter.  This is very good, but it does have some difficult moments.  And your AI squadmates are pretty dumb and do a great job of getting themselves blown up.  Considering, however, that the  Xbox version of GRAW is something less-than-stellar, the Xbox 360 version is great.

I picked up Syphon Filter: Dark Mirror for my PSP, and I've been playing that with some guys at work.  It reminds me a lot of Rainbow Six 3 for Xbox.  And the single player campaign is very good, too.  This game is very worthy of all the praise it received.

And then there's Grand Theft Auto: Liberty City Stories.  I actually have never been a fan of GTA, mostly on principle.  I don't have a problem with adult-themed games.  In fact, I relish them.  And the game itself is actually a lot of fun.  My problem with GTA is the adolescent testosterone-driven fanboys the games attract.  Yes, GTA lets you play as a person of rather questionably moral turpitude.  That doesn't automatically make it better.  It makes you immature for thinking a game can't be fun without hookers and gang violence.  That said, I'm having fun with GTA:LCS, which I rented from Gamefly.  Definitely worth a play if you're looking for something different on your PSP.