Ultrasn0w has been updated to version 1.2.3 with support for preserved baseband running iOS 4.3.3. In other words, ultrasn0w 1.2.3 does not unlock new baseband, but it does work to keep your unlock if you have been tugging along iPhone 4 with 1.59.00 or iPhone 3G & 3GS with 4.26.08, 5.11.07, 5.12.01, 5.13.04, and 6.15.00.
Sn0wbreeze 2.7 is out to jailbreak iOS 4.3.3 untethered. These are the steps to jailbreak iOS 4.3.3 on iPhone 4, 3GS, iPod Touch 4G, 3G and iPad. iPad 2 jailbreak is NOT out yet. Sn0wbreeze 2.7, just like PwnageTool, creates custom iOS 4.3.3 to jailbreak iPhone, iPod Touch and iPad. Sn0wbreeze 2.7 also preserves iPhone [...]