Dammit they're fast. It appears that Geohot (A.K.A George Hotz, the one who developed the original hardware unlock for the iPhone 1G) has booted up a jailbroken system on the iPhone 3GS. Potential jailbreakers, expect something fairly soon. I think Apple is just going to stop trying with the Cat & Mouse game now. They've raced down the the hardware level and subsequent hardware revisions are being pwned for life within a week of their release.