Here we go, the list of PS3 and PSP that will be playable at TGS. Let's look at the PSP titles first, including third party titles:

Sengoku BASARA: Battle Heroes
Shin Sangoku Musou: MULTI RAID
Musou OROCHI: Maou Sairin
KINGDOM HEARTS Birth by Sleep
DISSIDIA FINAL FANTASY
Clank & Ratchet: Maru Hi Mission Ignition!
Sarugetchu Pipo-Saru Senki
Patapon 2 Donchaka
BLEACH ~Soul Carnival~
Mainichi Issho Portable
Yuusha no Kuse ni Namaikida or2
LocoRoco 2
THE iDOLM@STER SP
Mobile Suit Gundam: Gundam vs. Gundam
Tales of the World: Radiant Mythology 2

There will be three unannounced titles from Sony Computer Entertainment. PS3 titles after the jump

Guitar Hero: Legends of Rock
FIFA 09 World Class Soccer
Street Fighter IV
Resident Evil 5
Lumines Super Nova
Metal Gear Online
Way of the Samurai 3
Sonic World Adventure
SOCOM: Confrontation
PlayStation Home
Mainichi Issho
MotorStorm 2
LittleBigPlanet
Resistance 2
WWE 2009 SmackDown vs RAW
Gundam Musou 2
Naruto: Ultimate Ninja Storm

The are unannounced titles as well. One from Irem Software Engineering, one from Konami, and nine from Sony Computer Entertainment.