I have recommended this in the past, a net radio station that you hear using Real Player. But I dropped it because they kept playing canned shows that were quite old and it was kinda embarrassing.
Have been listening and even tho its still canned, they have some great new selections and artists. Really good listening for song ideas, tune treatments etc. I finally heard Flook, Liz Carroll and some others who many of you had mentioned before.
Check it out at http://www.LiveIreland.com