PD-2/27/06
RD-8/9/07
EB2-NSC. two FingerPrints, one RFE.
Lessons learned:
1) While file I-485, do not forgot to put in the A Number from I140 approval (if you already have it)
2) Be really nice to your own hands, especially the thumbs, my RFE is because of illegible fingerprints.
Finally, be patient and all of us will be there (although I know that you won't feel so awesome once you are finally there - all the excitement has been exhausted during the long journey).