The iPhone Dev Team has released a new update to RedSn0w that untethers iOS 4.3.2. However currently there is an issue with the iPhone 4 and also the iPad 2 is still not jailbreakable. You can download the latest update here:
redsn0w 0.9.6rc14:
As always UltraSn0w unlockers should stay clear until there is a safe upgrade path. The iPhone 4 should be supported very soon. iPhone 4 is now fully untethered on iOS 4.3.2. As soon as we have more details we will let you know.
White iPad 2 is clearly the best.