Aquila Corde:  Produces the finest gut strings and synthetic strings for historical and modern music performances.
www.aquilausa.com

Damian Dlugolecki:  Modern gut strings for fine instruments, old and new.
www.damianstrings.com

Pure Corde:  Direct, flexible, traditional gut strings.
www.pure-corde-shop.com

National Music Museum:  Outstanding Collection of Musical Instruments located in Vermillion, South Dakota.
www.usd.edu/smm/ 

Metropolitan Museum of Art:  Besides a wide range of art, the Metropolitan Museum has an extensive Collection of Musical Instruments.
http://www.http://www.metmuseum.org

Violin Society of America:  Publications, Annual Conventions, Competitions, etc.
www.vsa.to 

All Violin Shops:  International World Wide Web listing of Violin Shops
www.allviolinshops.com 

The Strad Magazine
www.thestrad.com

The Strings Magazine
www.stringsmagazine.com

Montagnana Books:  Books on the Violin Family 
www.montagnanabooks.com  

The Guild of American Luthiers:  Founded in 1972, the GAL is a non-profit educational membership organization. A great resource for musical instrument makers, a quarterly magazine American Lutherie (with membership), plans and books. 
www.luth.org

Clarion Associates, Inc.:  The largest insurance firm dedicated solely to the needs of musicians worldwide.
www.clarionins.com