A new update for Apple iOS is available at the moment for iOS devices including the iPhone 4, iPhone 3GS, iPad, iPad 2 and iPod Touch.
The new update makes it harder and preventing from hacking and jailbreaking. Just few weeks ago, JailBreakMe found a way to jailbreak on the iPad 2 and easily jailbreak by downloading the Cydia from the JailBreakMe website.
With the new update, it would avoid hacking and jailbreaking but it would be a matter of time, for the jailbreaker to find a way to jailbreak on this new update of iOS 4.3.4