Huh...today's 4S 5.0.1 bump (9A406) has wide open main fs
According to MuscleNerd, this is the first publicly obtainable firmware ipsw where the main file system's key could be derived from the ramdisks (because the ramdisks aren't encrypted).
Now that file system is wide open for inspection, it's possible to get Siri files and such without piracy!
(to clarify: wide open for inspection from a Mac/PC...not wide open security wise :) Can get Siri files and such without piracy)
We'll keep you up to date on any developments in this area.