Here is some information about my case. Hope you may get some hints on the progress of your case.
EB1A NSC
I140: RD 04/2005,AD 06/2005
I485: RD 08/2005
NC pending since 08/2005
Contact congress woman 2/8/2007, sent inquiry letter to NSC 2/9/2007, Sent fax to NSC 2/12/2007 about NC Memo
I485: AD 2/14/2007
Hope all of you who have been stuck in the NC get relief soon.