Thanks to Lizzie Cornish on the "more session rudeness" thread for pointing this one out (and for having the patience to find intelligent life on Radio 2 - I haven't listened to it for years):

http://www.bbc.co.uk/radio2/r2music/folk/sessions/

Very clever. It's a basic Irish repertoire done in Flash so you get both audio and dots, and the musicians involved know their stuff.