Interviewed today (Miami - 03/04/2010) it took 5 minutes without a problem.
Reviewed my application, verified my address and phone number asked me 6 of the questions, asked me to read a simple sentence and write a simple sentence.
Signed a couple of forms including one that had the information that will appear on my Certificate.
IO told me that because my 5 year since residency was on the 10th of March she had to wait until then for approval but that I will get a letter in the mail shortly after the 10th.
She also told me that oath ceremony was on March 31st.
So just waiting for Ceremony letter.
My wife was also interviewed and it was exactly the same with a different IO.