The Critical Languages Institute (a division of the Arizona State University's Russian and East European Studies Center) provides comprehensive research and training in less commonly taught languages and cultures, with special geographical focus upon languages spoken in Eastern Europe and Eurasia. The Institute offers intensive nine-week summer courses in Albanian, Armenian, Bosnian/Croatian/Serbian, Macedonian, Polish and Tatar. The site is in English.
The Federation of East European Family History Societies should be the first stop for anyone researching East European geneology or family history on the Web.