Have Redistricting questions? Check out the U.S. Census Redistricting Portal:
http://www.census.gov/rdo/

Having problems generating GEOID’s from AFF check out the Tech Tips Here:
http://www.census.gov/rdo/tech_tips/

All you need to know about the 2010 Census Redistricting:
http://2010.census.gov/news/press-kits/redistricting.html