The biggest news in the past week was the jailbreakme.com method of jailbreaking your iDevice, however earlier today Apple said it will issue a patch that will close the PDF hole in iOS. As it has done in the past with other security issues, Apple will release an update in the coming weeks to close this hole.
Those that jailbreak their iOS devices will want to avoid this update. Ironically, those that want to close this exploit now can do so using this jailbreak tool. Just jailbreak your iOS device and install the PDF Patcher 2 from Cydia.