I have attached two files. I honestly have no idea where these came from or who wrote them nor how closely they reflect canon.
One is a pre war division/brigade breakdown down to the battalion level in many cases. The other is a July 2000 summary doc.
I have also found a pdf made by shrike6 amongst my files which I am hosting on rapid share due to it's size. (Over 9 meg)
http://rapidshare.com/files/267717939/orbat090.pdf