RD: 09/27/2005 to VSC, then transfered to NSC on on the same day as yours,
I called USCIS three weeks ago,then approved on Aug/02/2006,
In my friend's case, we filed I140 on the same day and transfered to NSC on the same day, but hers was approved on May/30/2006.
It may help if you call USCIS