A friend just recommended these guys to me. I had no idea I'd enjoy Irish folk rock this much. It's come a long way from The Unicorn Song.
http://www.youtube.com/watch?v=NHgIJAQb ... re=related (http://www.youtube.com/watch?v=NHgIJAQbH14&feature=related)
They're brilliant musicians, especially their a-capella songs are great... but if you like Irish folk, I can also recommend you "Fiddlers Green" from Germany.
//http://www.youtube.com/watch?v=7f07QQ5DMBI&feature=related