I filed I485 to TSC on 7/9/07 , but have not got finger print notice since then. Last Friday (7/25/08) I went straight to local office (made appointment online)to try my luck, fortunately, I got it (code 3) done right away at local office!
Please don't hesitate on going to local office and forget about waiting that mail notice.
Thanks for kind suggestions from nice people here.
good luck!