My wife and I caught Robinella & the CC String Band on Conan last week and they have a great sound. Bluegrass/country roots music. Tuneful, heartfelt. It looks like they've got an album coming out on Columbia, but you can also pick up their prior recordings on their web site. (Which I just did -- "No Saint, No Prize" should be arriving soon.) I'll post a review once I've lived with it for a bit.
Take that, Rob Duffy.