Here's the games I currently have(and those I actually play still will be in brackets):
Mercenaries 2- haven't played this since getting frustrated on the one level back in September
Uncharted- great Tomb Raider-esque game with some stunning visuals, but same deal as Mercs 2 has stopped my playthrough of it
(Grand Theft Auto IV)- I've had this since it came out in April, which was when I got my PS3. The online modes are the ONLY saving grace for this game AFTER you complete the story once. They seriously screwed up the aiming controls(in car) for weapons, the vehicle controls and the storyline was mediocre at best. Plus, you get a horrible 'reward' for shooting all TWO HUNDRED pigeons scattered throughout the city and ZERO rewards for each 10-20 that you eliminate, unlike prior games which rewarded you with a weapon pickup at your hideout.
(Little Big Planet)- fun little platforming game, where you can create your own levels and publish them online for others to play. I haven't even finished the main story levels yet due to playing ALOT with friends online in this.
Conan- If you liked God Of War, you should like this. The lead character is voiced by "Hellboy"(Ron Perlman) and while he is a bit deadpan in some of the scenes, he does convey a decent amount of emotion in most others.
I also have Timeshift for PS3, which you can pick up fairly cheap from Kmart($10) right now. It uses a system similar to that of the Prince Of Persia series from last gen, with the ability to reverse time. I haven't even opened it yet.