Something that you should be aware when your buy your T-Mobile G1 is that even when they said that they have 3G in your area what they really mean is that you are probably have it soon. To prove it I have prepared 3 pictures.
And the above picture is what you get.
Pictures say more than 1000 words. I have to add that I drove Yesterday around 2 miles in all directions from my house in a 3G hunting expedition and no 3G in anywhere.