Citizenship

Total time from mailing N400 to getting certificate: 4 months
N400 send: 6/22/2009
Finger print: 7/15
Interview: 10/21
Oath: 10/22
Got certificate: 10/22

Arrived 30 minutes early, parking can be difficult, get there at least 45 minutes before your appt.
Once you cross security check, take elevator to second floor and give appointment letter to Check-in window. The officer will then call you in when ready. My appt was 1.25, yet I was called in close to 2.30; and that's common as the office gets large number of cases.
Interview itself was fairly easy; started with writing a simple english sentence. Officer then goes over every question on N-400 basically making sure you understand it. At the end, you sign bottom part of N-400.
Civics questions (all from the booklet)
1. What is supreme law of the land
2. Who vetoes the bills
3. What is capital of your state
4. Who was the first president etc
I thought that part was so easy that everyone must be passing it. (Afterwards, I met someone who had flunked though. I guess failing it is pretty hard if you read booklet thoroughly even once.)

Interview officer was courteous, she said I did very well and congratulated me. She said another officer will verify the application and will let me know the result shortly. I came back to waiting room. By now, it was closer to 2.45PM.

Many people were waiting for Oath letter and I finally got it around 3.30.

The office usually conducts single oath ceremony per day, but on that day they ran 3. (1, 2 & 3pm)
But I missed the 3PM oath same day, and was asked to return next day at 1.

The next day was much more relaxed and fun than first. Checked in again and was told to head to seating area near ceremony rooms. Here, another officer asks and confirms the question on back of oath letter (did you get married since your interview, joined communist party etc).
Then long wait, we were finally queued up around 2.15. They first showed us the naturalization certificate and make sure your DOB and name are correct. Then you get a number and take a seat in ceremony hall. You also get a US flag, and two small interesting booklets, about constitution, great speeches by American leaders, famous foreign born Americans etc.
Long wait till everyone is seated and finally the director came to podium around 3PM.
She administered the Oath, explained rights and responsibilities etc. Then showed a couple of videos, one showing American landmarks, Oath ceremonies etc. Had nice music. Another one by President Obama, a short but excellent speech.
Then we queue back to check out window, where we get our certificate. They tell you over and over to make sure everything is right before you leave, so please do.

Tips:
1. Food is not permitted inside and on both days it took 2-3 hours; so make sure you eat/snack before entering. They only have water inside (no vending machines).
2. On Oath day, bring your family and take pictures. This is (likely) once in a lifetime moment.
3. Please bring something interesting to read, the wait is long and boring.
4. Cellphones: you can bring it in, but please make sure its turned off or on vibrate. You'll make officers very mad if it rings during interview or ceremony.
5. Be confident, courteous and enjoy the process.