iOS 4.3.2 has only been live for a few hours, but there it's already been jailbroken using PwnageTool for Phone 4, iPad and iPod touch 3G/4G, with support for the iPhone 3GS on the way.
This release does not include a carrier unlock, so any users who rely on one will be unable to access their networks if they upgrade to 4.3.2. The same goes for iPad 2 owners, as the release is unconfirmed on that device. As with any tethered jailbreak, you will have to boot into jailbreak state every time you restart the device. [Redmond Pie]