Bryan Caplan deserves credit for his web-based Museum of Communism, though the information is concentrated mostly on the Russian Soviet experience. I would be interested in a few entries distinguishing the forms of communism which came to prevail in, for example, Romania, where national socialism combined the worst of facism and communism. For those with an academic interest in the Romanian flavor of communism, Ceausescu.org offers details about its most destructive communist dictator, Memoria tells the stories of individuals, and AdmiNet provides a good general resource on news and recent history.