scales and finger charts http://www.stringskills.com
general orchestra information, instrument description, music history and more http://www.dsokids.com/2001/rooms/musicroom.asp
interactive metronome to practice with http://www.8notes.com/
tuning tips for the violin http://www.violinonline.com/tuning.htm
tuning tips for the viola http://www.violaonline.com/tuning-viola.htm
tuning tips for the cello http://www.celloonline.com/tuning-cello.htm