Geohot released blackra1n RC2 to fix many issues that might come across while jailbreaking your iPhone or iPod Touch with blackra1n RC1.

Also now you can Jailbreak iPhone 2G/3G & 3GS 3.1.2 firmware and iPod Touch 1G/2G 3.1.2 firmware on Windows and Mac

What’s new in blackra1n RC2

  • Fixed 3G issues
  • Tethered jailbreak for 3.1 OOTB ipt 8GB and new 3GSes
  • Fixed Icy issues
  • Available for both Windows and Mac

Link: Download blackra1n RC2