My case just has been approved by vermont center.
The basic information is:
EB1; priority date: Feb 4th, 2002; I-485 notice date: Jan 2th, 2003; I-485 approved date: April 6th,2006.
My application has been transfered from VSC to Whashington DC local office at July, 2003 and transfered back to VSC Dec, 2005.
good luck.