Say it's so, T-Mo! I just got word that T-Mobile will be lighting up the San Francisco area with 3G HSDPA service to coincide with next month's launch of the Android-powered HTC Dream. Whether or not "San Francisco" will include the East Bay, where I live and work most of the time, isn't yet clear to me. So I should probably stop with the Woo-Hoos and find out some more details.
T-Mobile is also planning to roll 3G out in Atlanta, Chicago, Los Angeles, Orlando, Philly, Sacramento (the capital of CA), and Seattle sometime right around the weekend of Friday, October 17. Birmingham, Denver, Detroit, Kansay City, Memphis, and Tampa are in line for their own 3G service before the end of this year, if "sources close to the project" (ahem) are to be believed.
I'm currently messing around with T-Mobile's first official 3G device, the Sony Ericsson TM506. It's a pretty cool flip phone, but I'm getting no 3G love here in Oaktown.