I'm in same situation too and my I-485 is pending since Mar'04.
On email enquiry to USCIS in the month of Feb'05 for case status, received reply back as "The cases are currently undergoing additional systems check. Please allow an additional 180 days for processing".
so really cannot re-initiate enquiry unless 180 days gets over (thats what my lawyer said though)
Thx
bsain
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Priority Date : Dec 11 2001(CSC,EB3).
I140 : RD 03-12-2004. Approved on 01/14/2005.
I485 : RD 03-12-2004. LUD: 10/27/2004,02/14/2005 (address change).