State and Metropolitan Area Data Book 2006

is now available online at http://www.census.gov/compendia/smadb/ It contains data published for 2005 population and housing unit estimates and many items from the 1990 and 2000 Census of Population and Housing for individual states, counties, and metropolitan.

Maps of Poland and Belarus

If you are looking for Polish topographic maps, you can get them through this site: www.mapywig.org It has scanned topographic maps of 1:300K, 1:100K, and 1:25K before WW2. (via Maps-L).