Jeffrey Biegel has discovered distance learning with the help of skype.
My own take is that at best this is an excellent tool that can be used within certain limits -technical and musical. My sense is that the art of teaching (and learning) one-on-one in the studio is still best. The communication (spoken and unspoken), immediacy, and the entire practicable field of perception is much greater. What say you? Still it has a place -and can be an important tool.