New York State Task Force on Demographics and Reapportionment
http://www.latfor.state.ny.us/

Prisoners of the Census - Explains the prison-based population counting issues very well and provides the text of the law that was passed in NYS with regard to county prison inmates for local reapportionment purposes the website generally
http://www.prisonersofthecensus.org/
http://www.prisonersofthecensus.org/NYS_A9710-D.html (specific to the law)

Brookings Institute - Transparency in the redistricting process
http://www.brookings.edu/opinions/2010/0617_redistricting_statement.aspx

Software Site
http://www.citygategis.com/autobound9.htm

Citizens Guide to Redistricting - while based on state redistricting it offers near the end the legal principles behind redistricting and some of the common pitfalls or pranks
http://brennan.3cdn.net/7182a7e7624ed5265d_6im622teh.pdf