3 links
Rhythm Bones Central
rhythmbones.com
History, regional names, events calendar, Bones Fests, bones players, vendors, Rhythm Bones Society membership form, mailing list, bibliography, discography, and videography.
The Groovy Percussion Guide
geocities.com
Information, rhythm notations, repairs, drumcircle listing, and forum.
The Hip Rhythm Digest
cactusjack.com
A collection of transcriptions of famous grooves and solos, along with rudiments and exercises, for PDF and download.