Was in same boat...
Hi GC92001 and thukralrk,
I saw that you filed a year after I did as I filed my I-485 in August, 2000. I only got approved in January of this year. As such, you have been waiting longer than the established bunch of days the USCIS says they are taking to process the case. It is time to contact the congressman/woman representing your electoral district to make an enquiry of the NSC as to why it is taking so friggin' long. This is what I did last year and 6 months later, our passports were stamped. Also, do not be afraid of interviews with the USCIS as the questions they ask are standand questions.
I hope this is helpful.
Rafiq