iH8sn0w has released the fourth beta of 2.3 includes Sn0wbreeze in this long-awaited new version, or the ability to run the Unlock the baseband 01.59.00, 04.26.08, 05.11.07, 05.12.01, 05.13.04 and 06.15.00 Ultrasn0w through. Were also fixed some minor bugs and restore the optimal functioning of iBooty.
Recall that this is not a definitive Jailbreak devices iOS updated to firmware 4.3. So if you want to run a firm and final jailbreak, you should wait for new specific tools that will soon be released.
You can download Sn0wbreeze 2.3 beta 4 from http://ih8sn0w.com/sb23beta. Recall that the program is not available for Mac, but only for Windows.