Got the oath letter right after the interview.
DO: Lawrence, MA
Time line:
09/26/09 Applied for N-400 (5 year GC based)
09/28/09 Priority Date
10/22/09 Biometrics (Finger Prints)
11/10/09 Transfered to local office
11/17/09 Scheduled for Interview 12/22
12/22/09 Interview
03/04/10 Oath Date
Congrats!