DEMOS:

Blast Factor (Sony, Action)
flOw (Sony, Action) -the entire game is free iirc-
Lemmings 2 (Sony, Puzzle)
Kazuo (Sony, Puzzle)
Puzzle (Sony, Puzzle)
Mainichi Issho (Sony, Action) -no demo available-
Ridge Racer 7 Demo (Bandai Namco, Rennspiel)

PS1 games:

Biohazard Director' s Cut (Capcom)
Konami Antics MSX Collection Vol. 1 (Konami)
Konami Antics MSX Collection Vol. 2 (Konami)
Bishi Bashi Special (Konami)
Arc The Lad (Sony)
Jumping Flash! (Sony)
Everybody' s Golf 2 (Sony)
Silent Bomber (Bandai Namco)
Tekken 2 (Bandai Namco)
Mr. Driller (Bandai Namco)



[link=www.gamefront.net]GameFront

I' m sure that more will be added to that list as launch approaches, however you have to ask yourself how big a demo of a game like Resistance: Fall of Man would be since the final game fills a 25GB disc...

EDIT: The article says that there will be 10 Playstation titles added every month. To start with they' ll only be playable on PSP.

They can probably squeeze it down to 1000gb like a 360 demo :P

A bit off topic but I didn' t want to start a new thread just for this. Some new PS3 pics.

http://media.ps3.ign.com/articles/741/741368/imgs_1.aspx