I just resurrected my Squeezebox after over a year in exile. (The SB, not me

). Even before I mothballed it my favorite stations had gone defunct. "Women of Rock" was one of them.
The new SB categories don't seem to offer what I want. I would appreciate recommendations for internet stations that play singer/songwriter music. Artists who cover that type of music but don't write much on their own are also welcome if they do great covers like Eva Cassidy did. It could be either acoustic or rock. It could be folksy, blues, or contemporary.
I will list some of my current and past favorite artists so you will have a better idea of what I am talking about. I don't need a station that plays their music exclusively. I have their CDs and a much better playback system for them than SB offers. What I am looking for is new artists that will make me want to buy their CDs.
Current and past faves:
Joni Mitchell
Emmylou Harris
Melody Gardot
Lucinda Williams
Laurie Anderson
Michelle Shocked
Kate Wolf
Tom Rush
Ian Tyson
Bruce Springsteen
Hans Theessink
Thanks for any suggestions.