Resources:
Mandolin Cafe --for all things mando
Jazz Mando -- for the curious jazz mandolinist
Mando Information blog with interesting links world-wide
On-line metronome -- includes animated beat numbers/accented beat settings
On-line music dictionary --for decoding Italian adverbs and other such things
Mandolin Central-- calton cases, and a fine selection of  vintage instruments
Mandolin Symposium -- Week-long Mandolin Nirvana in June
Audacity -- free, cross-platform, audio editing software
Glen Gould playing the Bach 2-Part Inventions
Old Timey Art -- prints and greeting cards featuring watercolors on old timey/ musical themes, by Tracy Bigelow Grisman
Lakota Leathers-- fine leather musical instrument straps, made with native leathers on Lakota Sioux Reservations in South Dakota, USA

Musicians:
Danilo Brito
Ashley Broder
David Grisman
Caterina Lichtenberg
Dudu Maia
Mike Marshall
Ami Molinelli
Carlos Oliveira
Mirko Schrader
Don Stiernberg
Tony Williamson
Radim Zenkl

Amusements:
Yo-Yo Ma in a head banging quartet
Piano tab? Don't even think it --Scroll down to "Rachmaninov had big hands"

Dealers Carrying String Thing Music Titles:
Gryphon Stringed Instruments, Palo Alto, CA

SF Bay Area Organizations:
Aurora Mandolin Orchestra
Bay Area Country Dance Society
California Bluegrass Association
Freight & Salvage
San Francisco Scottish Fiddlers

San Diego Area:
San Diego North County Bluegrass & Folk Club