We already mentioned that T-Mobile customers can pre-order the G1 now, but there's a lot more to the G1 website up now. Check out the specs page for good information:
3 megapixel camera
Touch Screen
IM, Text, and Email all support and will work with multiple services
3G -- you can find out whether or not T-Mobile has 3G in your area
Included applications like Maps (with Street View!), Gmail, YouTube, Calendar, and Google Talk
174(forum posts)