Let me be clear here, if you own a T-Mobile G1 branded Google Android device DO NOT ATTEMPT TO UPDATE using any of these ADP/HTC images and methodology (besides from the official T-Mobile).

For those adventurous souls with a T-Mobile G1 you could check out the XDA Developers site to try out some hacking with your device. If you have any concerns at all about bricking your G1, then I do not recommend you try these methods and instead you should wait for the official T-Mobile G1 update.