Mettadore -
I found a list Conal Ó Gráda made for me of sean-nós singers he likes. One of them, Iarla Ó Lionard, is featured in a documentary video which includes his version of Aisling Gheal, one of the songs you mentioned in your original post: http://www.youtube.com/watch?v=Kyp1ixrE-DA&list=PLB9C95CA6C1911FB5&index=6&feature=plpp_video
Conal also likes Róisín Elsafty, Darach Ó Catháin, Lillis Ó Laoire, and Cathal McConnell, as well as Eamonn Ó Donnachú (sp? Conal’s list is hard to read), recommended already by Cathy Wilde. He recommends Róisín White and Rosie Stewart for ballads in English. There are other great videos out there - I’ll post a couple more separately, since I can’t figure out how to link more than one at a time in this post 
