OH (original hacker, yo!) George Hotz has posted the RC2 version of his iPhone 3GS jailbreak tool,
purplera1n. Along with other improvements, the new version supports Vista, Windows 7, and supports 64-bit.
If any of the above interests you, and you’re a responsible adult who understands the risks involved, hit the link below and check it out. Jarrrr!
Change Log:Vista, Windows 7, International, 64-bit support
Less flakiness in the payload
Cydia tar cleaned up
Improved logging with slightly more useful errors
New kernel patches, codesign errors gone. Props posixninja
Added vm_map +x, passed vm_check
No winterboard yet, but now that ball is in Saurik's court :-)
Still in beta, use caution