This is very fast. Dev team has just released new version of Redsn0w 0.9.6rc15 to bring untethered jailbreak for iOS 4.3.3 on iPhone 4, iPhone 3GS, iPod touch 4G, iPod touch 3G and iPad. iOS 4.3.3 untethered jailbreak is based on i0n1c's untethered exploit.
Here's step by step guide showing you how to jailbreak iOS 4.3.3 untethered using Redsn0w 0.9.6rc15 (Win / Mac)
Step 1: Download iOS 4.3.3 for iPhone, iPad or iPod touch (download links at the end).
Step 2: Restore to iOS 4.3.3 in case you haven't yet using the IPSW file you just downloaded via iTunes 10.2.2.
Step 3: Start Redsn0w and point it to the official iOS 4.3.3 firmware file.
Step 5: Now make sure your device is both OFF and PLUGGED IN to the computer before you click “Next”.
Step 6: Wait until you get untethered iOS 4.3.3 jailbroken in few minutes.
Note: If you rely on ultrasn0w unlock don't follow this guide, you have to follow This Guide (PwnageTool 4.3.3) or This Guide (Sn0wbreeze 2.7) to preserve your old baseband to unlock with ultrasn0w
Download Redsn0w 0.9.6rc15 for Windows
Download Redsn0w 0.9.6rc15 for Mac
Download iOS 4.3.3 for iPhone, iPod touch, iPad
Download iTunes 10.2.2