Yes, the iPhone PwnageTool is now officially available. This hack allows users to “load in any firmware you want, including patched firmwares not signed by Apple.” Information page. Video after the break.
We did what most people are probably going to do, however: we took a brand new 8GB iPhone, unlocked it, and upgraded to the 2.0 firmware, while keeping it active on T-Mobile. It’s not exactly a one-click process, but it’s not all that hard either