Earthworm Jim - Could be similar to the style of Rayman Origins.
Oddworld - Particularly one with Abe or perhaps even Munch.
Road Rash - Played this on PS1 all the time, so an updated one with new physics, graphics, and more features would be insanely awesome.
Crash Bandicoot - If and only if Naughty Dog takes the helm on this project.
Syphon Filter - If given a chance, it could easily be a sleeper hit.
Jak & Daxter - Still not sure why Sony hasn't given on of their exclusive titles a PS3 version.
X-Men Legends - Absolutely loved this, but I feel that this may be a little too similar to Marvel Ultimate Alliance.
Jade Empire - I'd kill someone if it meant me getting a Jade Empire sequel.
Others I'd like to see include Destruction Derby, Gex, and Bloody Roar.