It seems you can use DD in Linux to dump your PS3 games.

Someone has successfully managed to dump Madden 07 to an external hard drive. Im sure you could dump it to your built in hard drive as well.

After mounting your external hard drive on a mount point you can dump the raw image of the PS3 Blu Ray using this command.

dd if=/dev/cdrom of=/mnt/exthdd/imagename.img

This doesn't mean we will be playing ISO's tommarow, but for any groups who haven't discovered it, this will definitely give them a look inside the Blu Ray Disc

The RAW Image of Madden 07 was 7.08GB, proving to the world that Sony's full of crap on saying their games are using the Blu ray disc to the maximum already.