2getgc,
My sincere conratulations!
I am EB2, world, I-485 pending since May 24th, 2006. Stuck in name check.
I was wondering if the response you got from USCIS on 06/06/07 was this "delayed due to your background investigation remains open" letter.
Was it the case?
The letter from USCIS told me that my case was still within their processing time. My FBI NC was finalized on May 1, 2007 per letter from FBI