Patrick Costello links…
Someone at work asked me for a link to the How and Tao books, so I put this together for him.
I'm very seriously considering putting together a comprehensive link list to all this material.
Patrick Costello, Pik-Ware Publishing...
http://www.pik-ware.com/
Patrick's blog...
http://tangiersound.wordpress.com/
Just search for the titles of his books to find links to the free copies.
His DVD workshops for banjo and guitar are also CC licensed... links to them are in a comment on this post...
http://tangiersound.wordpress.com/2007/07/19/pik-ware-retires-dvd-workshops/
Folk Song of the Day videos...
http://www.youtube.com/profile_videos?user=Dobro33H
(They're also available on archive.org in downloadable formats.)
There's more material... a podcast or two, the "Weekly Workshop" video where he and Pat Sr mostly answer mail from fans.
There's a lot of older material out on archive.org which isn't linked from any of his active websites.... at the end of last year, he deleted his old website because it was creating too much work, and in doing so abandoned a lot of old material. It's all in the Wayback Machine on archive.org, but it's painful to pick through. howandtao.com is the domain name.
So he makes all kinds of stuff available for free, but doesn't take the time to make it easy to find. That's why I'm considering putting together a comprehensive list, as I've found most of it already. :)