Hello, This site helped me a lot and I would like to share my story.
Came in USA on tourist visa B2, extended it while I was here, got married before visa expiration.
June 14, 2013 - got married
July 13, 2013 - sent my package to USCIS
July 22, 2013 - got receipts
July 28, 2013 - got fingerprints appointment date
Aug 13, 2013 - fingerprints done, very quick, 10 minutes and you are out
Aug 24, 2013 - request of evidence, was asked to mail my husband's tax returns. Added my pictures, letters from friends, joint bank statement, join bill, flight tickets together
Sept 28, 2013 - got notice that interview will be on November 5th
Oct 7, 2013 - got EAD for 1 year
Nov 5, 2013 - interview started at 9:15am, we were approved and happy out at 9:30am, very easy, no tricky questions, we were smiling, joking and had a good time
Nov 12, 2013 - got email saying that my Green Card was mailed, got tracking number, estimated delivery Nov 14. it wil be a good present for our 5 month marriage anniversary :)
All the best and good luck, if your marriage is real no reason to worry!!!