If you live in Chicago, DC or Baltimore..(I think?) you want to sign up for the trial of this service.
http://www.xohm.com/
I saw a demo of this while traveling last month and was very impressed with the speeds I was seeing. It was a Sprint employee with a laptop I met and I asked them what network they were hooked up to and I got the story about this trial. Very robust speeds. I think it's still employee only right now but should be open in those three areas in the next couple of months.
