Comex has released his second version of the PDF patcher for jailbroken iPhones, iPod Touches and iPads. PDF Patcher 2 closes the same exploit that made the JailbreakMe 3.0 userland jailbreak possible. Ironically for Apple, the only "secure" devices from this exploit are jailbroken devices.

Once you use the exploit, via, it's recommended that you install PDF Patcher 2 to close the hole before it is used maliciously on your device. PDF Patcher 2 can be downloaded and installed for free from Cydia.