We have found the links below useful (even for a pdf). Those digging into the 2010 Census data might want to take a look.
The record layouts for each shapefile layer contained in the 2010 Census Redistricting (P.L. 94-171) TIGER/Line Shapefiles as well as relationship files. Shapefiles are listed in alphabetical order by geographic entity type. http://goo.gl/1BFrv
2010 Census Redistricting Data (Public Law 94-171) Summary File http://goo.gl/sPBeO
American FactFinder http://factfinder2.census.gov/main.html
Select 2010 Census data for AR is available at http://goo.gl/cRudq