Some artists that I've recently been listening to include:
Dervish: great roots Irish trad band
Muireann Nic Amhlaoibh: flautist and vocalist, solo performer and lead of the band Danú
Julie Fowlis: Scottish singer from the Outer Hebrides, Scotland, beautiful voice; Gaelic.
Clandestine: Houston-based band, bagpipes. Defunct as of 2003, but recently reformed with change in membership (http://en.wikipedia.org/wiki/Clandestine_(band))
Natalie MacMaster: Cape Breton fiddler, sometimes playing trad, sometimes rock-fusion, always good
Ashley MacIsaac: Nova Scotian fiddler…