I have discovered some odd behavior which may potentially lead to playing backed up blu-ray games. Copying this specifically crafted TIF image to a USB stick, and attempting to open it seems to cause the PS3 some confusion. While the console remains responsive to controls, youre able to browse the XMB and launch a game. The game won't fully launch allowing time for a disc swap. Once swapped, remove the USB stick, and the new game boots no errors!
This potential TIFF exploit has been tested on firmware 1.31, 1.80, and the latest, 1.90. Further testing is underway, stay tuned for updates.