The Orchestra
The Orchestra: A User's Manual Violins
A wonderful resource covering many aspects of the violin. Most explanations are made with video and audio clips of members of the Philharmonic Orchestra. Be sure to check out the players tips and tricks section.
Other
David Gusset, Violin Maker
In addition to describing the work of violin maker David Gusset, this attractive site offers sections on instrument design, history, construction, materials, appraisal, and more.
Other
The Violin Site: Violin Making
If you are interested in learning how a violin is made, you will enjoy this site. There are also references to famous violin makers.