Great news! From February 13th through February 16th T-Mobile is going to waive all activation fees AND upgrade fees for "qualified purchases". We have no idea what "qualified purchases" actually means so we're just going to think of this offer as a Valentine's Weekend Special of sorts. Supposedly, this deal will also work online as well.
So if you've been on the fence on getting yourself that T-Mobile G1, this weekend is as good as any!