There are two other books availible under Creative Commons.
Here's the link for the free online version of "The How and the Tao of Old Time Banjo" ; http://funkyseagull.com/book/tao.html
The free version of "The How and the Tao of Folk Guitar" : http://www.funkyseagull.com/book/tao.html
There is also a bunch of free banjo workshops at: http://www.funkyseagull.com/workshops/workshops.html

-Patrick