In addition to Bends Uncharted, and Liverpool's Wipeout.
San Diego Studios also made MLB:The Show and Modnation Racers, and they are working on Warriors Lair.
They moved Team Siren's PS3-game Gravity Rush to the Vita, they also had Hot Shots from Clap Hanz, and Japan studios. And Little Deviants by BigBig and Unit 13 were also made by Zipper, MotorStorm: RC by Evolution.
So after 2 months Sony has made 9 titles inhouse (not counting some smaller titles from London and Japan Studios), in addition to 2nd/3rd party stuff they have agreed to publish stuff with developer-partners, like Top Darts, Reality Fighters, Escape Plan, Super Stardust Delta, Hustle Kings, Pure Chess, etc. wich are are Sony properties, I think.
Upcoming stuff like Little Big Planet, Killzone, Frobisher Says, Resistance: Burning Skies, Sound Shapes, Smart As - is also stuff in the pipeline from Sony wich I recall at the moment. So I wouldn't say Sony has been lazy so far.

And I think we'll see alot more from them at E3, while third parties will be most active at TGS.