The most simplest thing to start with use by on the fly patching of the disc autorisating calls so that would probably be the first mod to see just like the xbox 360 and the wii.
The problem here is that EVERYTHING outside the Cell is crypted, including the BluRay drive calls. Also, we don't have any information about how the drive works or how is its firmware.
It's not the same as 360 and Wii, because those are DVD-Drives (less security and how they work is well known) and on PS3 we have a BR-Drive, with much more security, without knowledge of its firmware, where
everything it does is crypted, completely controlled by the HyperVisor, and we don't even know 100% how to make a backup of a PS3 game. (it's not clear yet if the "swiss army knife" backups will ever be bootable or not becuase we don't know 100% sure if the backups are well done)
That is the reason why I doubt about the credibility of the "PS3 firmware for Argon on development" quote that was hinted and confirmed by OscarHS... Well, they might be trying, but they can be at 0% right now, and that's what I think when another admin said that something like that will be months or years away. That's why I ssaid all regarding PS3 is to create hype or to make us "stay" with Argon (I still stay for the Wii anyway)