iPhone Dev Team releases PwnageTool Application - Install custom iPhone firmware .ipsw bundles
...ipsw firmware bundle. By exploiting a fundamental hole in the iPhone firmware loading process, PwnageTool forces iTunes to ignore firmware integrity checks. That means iPhone firmwares can be jailbroken and bundled with unsigned (unofficial) third-party applications - so you don't have to do the iPhone jailbreak ho-down to get those fun...
