"Reporting Census 2000": http://cronkite.pp.asu.edu/census
Shapefiles can be downloaded from the Census Bureau at www.census.gov/geo/www/cob or from ESRI's ArcData Online site at www.esri.com/dataonline.
You can practice with the "TIGER Reader" extension now by downloading the 1998 TIGER files for your state from www.census.gov/geo/tigerline/tl_1998.html.