Eastern Europe, The Multicultural Arena
Dr. K. F.'s site, a Professor of geopolitics and history specialized in Central and Eastern European countries.
http://www.omnibusol.com/easteurope.html#contents

Atlas historique périodique
Historic atlas for various regions of Europe from year 1 to year 1700.
http://www.euratlas.com

Don Mabry's historical text archive
Online access to history books, of which Central Europe's History, by Oscar Halecki.
http://historicaltextarchive.com

Internet Modern History Sourcebook
Sourcebook on the history Central and Eastern Europe since 1945 .entirely accessible online, from the University of Fordham.
http://www.fordham.edu/halsall