It seems that no matter what steps Apple
takes to prevent people from jailbreaking their devices, within no time at all enthusiasts have bypassed those steps.
A few days ago
Apple released the iOS 4.3.4 update to stop hacking and jailbreaking, specifically an exploit in the way PDF files handle fonts. This exploit could potentially allow a malicious PDF file to sneak malware onto users' devices, or more likely, could allow users to easily jailbreak
their devices with websites like JailBreakMe
Within a mere 12 hours of the update's release, users eager to escape Apple's restrictions had already gotten around the patch
Alas, the jailbreaking method does not yet work for the iPad 2 (for which the previous exploit did), and those devices that can be jailbroken are "tethered" - meaning, basically, that whenever their device loses power or is reset, the user needs to go through another (shorter) process to re-jailbreak it. A faster/more complete method will inevitably come, but for now, iOS users eager to unlock their devices will have to make do.