Purplera1n. My experience
all you'll be able to do is boot your phone in recovery mode, and then it gets stuck there.
thats on windows vista 32 bit, program set to run in XP service pack 2, and as administrator.
Dont even bother at this time, there are few success stories but this program was put together poorly.
although, i do agree with geohot that the JB should be released now, and seeing as it has been revealed with this poor excuse of a JB program thats dubbed 'purplera1n'
dev team should just release theirs.
besides, Geohot said he'll find another hole next week :P
24 HOURS HAVE PASSED
i installed windows XP with SP2 thru bootcamp on my macbook, and what do ya know, worked like a CHARM
the really bad part about it is that unless you have XP the process is going to fail and or frusturate everyone to hell
but yeah, loving my jailbroken 3GS :D