Patrick Costello and Dear Old Dad are offering banjo lessons as MP3s. They will not release the next lesson until five people email them with recordings of their exercises from the previous lesson. Neat idea. Link
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. Come and hear Mark speak at the ALA conference in Chicago on July 1.