Fiddlerman.com

Awesome resource for violin music lessons and news.  Many, Many Videos.

Violinmasterclass.com

Kurt Sassmannshaus Violin Website.  Excellent Resource

Stringtechnique.com

Michael Hopkins website full of pedagogy information

Violinonline.com

Exceptional Violin Resource with pictures, tips, and techniques.  There is also a great interactive fingering board.  As well as scales and etudes.