Some big exclusive titles currently available for PS3 are:
Infamous
LittleBigPlanet -
meh
Killzone 2 -
Good game
Metal Gear Solid 4 -
Didn't like it
Gran Turismo 5 -
If it ever comes out 
h Done with racing games
Uncharted -
Played about 5 minutes of it
And some upcoming ones:
Heavy Rain
The Last Guardian (new ICO game)
MAG
Uncharted 2
Final Fantasy XIV -
Will be multi-platform like XIII Which is taking forever to come out anyway
God of War III -
Played it Comic Con and DAYUM!!! AWESOME game