Tether Free
Use the tethering function on your iPhone without requiring a bolt-on.
Developer website: Lawrence Dudley
Tether Free lets you use the tethering function on your iPhone without requiring a bolt-on.
At present it only functions with the iPhone 3G, using the iOS 3.0 that was released yesterday and when you are using either O2 UK or ATT US as your carrier.
Support for other network providers is on it's way in the next day or so.