As far as i know it works like this:

PS3 Games: Region Free

PS2 Games: Region Locked

PS1 Games: Region Locked

Bluray Movies: Region Locked

DVD Movies: Region Free

I know this cause ive ordered and played several games from the US for PS3 and also some Region 1 DVDs (just watched Evangelion 1.0 which is region 1 and worked fine)