I have been looking for some functionality on a jailbroken app that does not seem to be out there. Basically, if somebody loses their iPhone there is now the capability to "Find My iPhone" and locate it on a map. Although MobileMe has always had this along with many other things which are useful only when the phone is switched on. My thoughts are to have an option to have the power button disabled for when the passcode lock is enabled. This way the thief cannot turn the phone on unless they get to a computer to put it in recovery mode etc.. Giving the owner more time to locate or deter the stealing of their iPhone. I dont think it is a hard one to do but I am not a developer so wouldnt know really. If anyone thinks they may be able to do it I would love to hear from them.