Resistance, Motorstorm, Uncharted and Ratchet are made by sony's second party/first party developers and since Sony owns the rights for the IP, I dont think we can count them. Lair and Heavenly Sword are developed by independent studios but published by Sony, can they be considered third party.
On HeavenlySword.com it says
Heavenly Sword ©2006 Sony Computer Entertainment Europe, so i can guess it is a first party release by a third party developer.
The same goes for Lair ©2006 Sony Computer Entertainment America.
The only true third party releases are the ones that are not published by Sony.
Ubisoft's Haze (the timed exclusive status will give sales a huge boost)
Activision's Guitar Hero 3 (i they make the GH1,2 guitar compatible with the PS3)
Activision's Call Of Duty 4 (if it is not delayed for the PS3, unlikely since they do not use the Unreal Engine 3. ref: Stranglehold and the new MOH game)
MAdden 08 (this game is going to be huge, sold about 410K when it was a launch title, should hit 1 million within a 15-20 weeks of release)
PES 2008 (this game is going to be for E.U and Japan, suppose to be designed from ground up for the PS3, the leaked screen shots looked out of this world)
FIFA 08 (I expect FIFA to lose the sales crown to PES 2008 unless they switch the lead platform from the X360 to PS3, PES on PS3 is going to murder FIFA 08 on PS3 unless EA gets its act together, it will hit 1 milion within a month never the less )
Heeeeyyyy!!!! <Snap>
