Dr. William Sanders seems to be the guru for value added assessment.
http://www.sas.com/govedu/edu/bio_sanders.html

Another suggestion is Theodore Hershber, Professor of Public Policy and History and the Director of the Center for Greater Philadelphia at the University of Pennsylvania. Here's info on value-added and NCLB.
http://www.cgp.upenn.edu/ope_nclb.html

This report discusses value-added systems used in different states. Details are in the appendix.
http://www.effwa.org/pdfs/Value-Added.pdf