I wanted to add some comment to the list. I have Batman: Arkham Asylum, I was able to backup the save using the hard drive backup utility from PS3 and restore it to be used in another PS3. And I was able to copy the save file to USB flash drive without problem. The save is not locked to my PSN account either since I am able to load the save file using another username.
By the way, I have US verison of Batman: Arkham Asylum.
Also, go and vote for this at Playstation Blog Share, it might not get Sony or developers to drop the locked saves, but it should raise some attention.
I am not the one that created the idea, just passing along.