I don’t know if this is old news with you all, but I stumbled on this on the woodflute list.. head to:
http://www.kennedy-center.org/programs/millennium/search_results.cfm
Do an archive search (at the bottom) for “Lunasa”. Then you’ll be able to see an hour long Lunasa concert with Realplayer. Quite breath-taking. Didn’t have much problems watching the video despite having a 56k modem.
There are also other archived performances at the Kennedy center you can view, like Karen Casey, Danu, the Scoiltrad team, etc. Search for “Irish” to get the full list.
Enjoy!