Jailbreaking has gone into the cloud. Visit the Jailbreakme.com website on your iOS device, slide the big button on the front page (which cheekily mimics Apple’s slide-to-unlock button) and you’re done. It’s that easy. It works for iPhones (including the iPhone 4) and also iPads running iOS 3.2.1.
Jailbreaking – the unlocking of an iPhone or iPad to allow access to the file system and install any app you like – used to be done via your computer with a downloaded program. You’d plug in the iDevice and work from there. It was easy, but this is easier still.
Full story: Gadget Lab – Hardware That Rocks Your World | Wired.com