PERM PD: 03/2006.
EB2 I-140 approved 07/2006
I- 485 filed based on EB-2 on 08/10/2007
EB1b 140 filed 06/2007, approved 09/2007
Request to relink I-485 to EB1b
I-485 approved 5/30/2008.
My experience is to make an excuse and contact USCIS once in a while to make them update your case. My case was updated once in a while, 6 LUD before from submission to approval.
Thanks people in this forum, especially pjiang and xiaobaitu and others. It has been a way to calm down my anxiety by visiting the forum everyday.