Geohot has released the second version of the iPhone 3GS jailbreak, this release includes:
- Vista, Windows 7, International and 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.
- Still in beta, so use caution.
Sam's Blog 