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, you’re 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.