TZones is giving folks 3G speed right now in NYC. I believe ThorBlaze Dragon posted about this in the T-Mobile forum. So TZones for $5.99 or T-Mobile Internet for $19.99, either one should do.
Edit: it was not TBD, but here's the thread: http://www.howardforums.com/showthread.php?t=1368060
Edit: it was not TBD, but here's the thread: http://www.howardforums.com/showthread.php?t=1368060