Went to the US embassy/consulate in Athens, Greece on Oct 17 (citizens services appointments are not plentiful... had mine scheduled in August!).
They made a copy of my naturalization certificate (+ gave me back the original), and told me that I will get my passport "in about a month". Email on Oct 25 "your passport has arrived at the embassy - we are sending it to you via courier". Arrived the next day.
Note that I had not requested expedited processing.
The downside is I did not receive the passport card I requested (apparently it is fairly common). Need to contact them, though, as they do not have a self-addressed envelope for that - unlike for the passport).
Can't complain though!
-- h
PS1 I left the US by train (NYC -> Montreal - lovely trip - HIGHLY recommended) using my Enhanced Driver's license (that I got 10 days after applying, which happened 2 hours after taking the oath, at the DMV downtown NYC)
PS2 I suspect I did not really need the Enhanced Driver's License to enter Canada - my greek passport should have sufficed (it did, in the past...).