I've embedded some of my favorite songs of his, but he's got a ton of varied songs (Irish ballads, slave songs, spirituals, folk) and is an incredible guitarist. If you like this stuff, be sure to check out his record label, Waterbug records. They've got a big stable of talented artists (right now I like Jonathan Byrd, Anais Mitchell and Michael Troy).
Enjoy some aural pleasure, ducklings.
Other favorites: Peach Song, Long Legged Lover, Recall, I Love You All the Time, Fred's Family, Farewell Butterfly.