Georgian Sources (either in Georgian or by Georgians)
International Research Center for Traditional Polyphony (Tbilisi State Conservatory)
Part of Tbilisi State University and host to the biennial International Symposium on Tradtional Polyphony. There are many resources scattered throughout the site, including music samples, a basic searchable database, and past papers from the symposium in Georgian and English.
NOTE: The site seems to go down from time to time. If it's not up, try again the following day.
Music in the Republic of Georgia
Webcast of a demonstration lecture by the Anchiskhati Choir, hosted by the American Folklife Center at the Library of Congress. Real player plugin required (ugg).
Website by ethnomusicologist/musicologist John Graham, containing works by a few prominent Georgian ethnomusiologists. Also offers educational tours in Georgia.