Just last week, Apple released iOS 4.3.4 to patch the nasty PDF exploit which was actually being used to perform untethered jailbreak on iPad 2 and iPad 1. We have today come to know that it has not only patched the PDF exploit but has also fixed the vulnerability that allowed the jailbreak gurus to perform untethered jailbreaks.
This implies that it may take a quite some time for the jailbreak community to come up with a workaround. It is clear that while jailbreaking is perfectly legal in US, it is something Apple does not wants the end user to do as vast majority of jailbreaks are performed to get apps the illegal way. Nevertheless, we thank the awesome jailbreak developers for the amazing work they have done so far.
However, if you have earlier backed-up the SHSH blobs, you can downgrade your iPad from iOS 4.3.4 to 4.3.3 and then perform either of these jailbreaks.