TinyUmbrella has been updated to finally support windows for the recovery fix! I've personally tested in XP and Windows 7. Please let me know if you have (non-DFU) issues. If you need help getting into DFU mode, use google. Check the change log for more info. As an aside, I've also added 4.3b1 support to this version. Enjoy!
EDIT: I had to do a hotfix for the iPad3G. If you don't have an iPad3G don't worry about re-downloading!