Those who are still waiting for a decision on their naturalization application or for an oath letter could mention the timeframe of their entire case along with their district office name in their signature line or somewhere so that it could greatly help others who are in the same boat. Otherwise, it wouldn't say much nor it will help much to others.
Here is my signature time line...chicago office
05/31/2008 -- N-400 Sent
06/06/2008 -- N-400 Received
06/13/2008 -- NOA Received
06/20/2008 -- FP Letter Received
07/03/2008 -- FP Completed
09/04/2008 -- IL Received
10/03/2008 -- Interview Completed, Decision can not be made.
10/23/2008 -- Request for Additional Documents Received.
10/30/2008 -- Additional Documents Sent.
11/06/2008 -- Further Interviewed over the Phone by the same IO.
11/17/2008 -- Info Pass - still Waiting on decision.
12/06/2008 -- Request for further Additional Documents Received.
12/30/2008 -- Additional Documents Sent.
??/??/???? -- Oath Letter/Date