I-485 approve notice by email

This website is very helpful during my application for I-485. I think I have to share my case to appreicate all your inputs.

08/2004: Apply for I-485 (EB2, NSC)
10/2004: finger print
05/2005: finger print
Got the confirm that case is under security checking.
02/2006: finger print
contact local congress man(07/2006), was told I should get GC in 2 months.
contact senator (07/2006) and was told my case is still under security checking.
08/2006: RFE
09/08/2006: welcome notice (email)
09/13/2006: approve notice (email)