Post here if you didn't have success with the first version, and find the RC2 does a better job.
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