Great YouTube videos for detailed information on biochar:

http://www.youtube.com/watch?v=1-hSl59ET2A&feature=relmfu

The following video is a bit technical but very good.

http://www.youtube.com/watch?v=pX3zhZ6ETWI&feature=related

 

Biochar Articles:

http://www.sciencedaily.com/releases/2006/03/060301090431.htm