MUSICAL KNOWLEDGE AND SKILLS

Musictheory.net 
Offers excellent trainers and guides for improving your own personal music theory knowledge and abilities. Use this to practice note reading, key signatures and more!

Mutimedia Online Music Dictionary
Created through Virginia Tech University, this is a great comprehensive resource for all musical terms and symbols.

Metronome Online
This online metronome allows you to practice with a very honest time-keeper!
Just pick your tempo, turn up your speakers and go!!
Also includes some in-depth explanations of the uses of a metronome and other instrument resources.

INSTRUMENT RESOURCES

     Flute World
     International Clarinet Association
     The International Saxophone Page
     The International Horn Society
     The International Trumpet Guild Youth Site (ITG Junior)
     Online Trombone Journal
     Tuba/Euphonium Links

Vic Firth Percussion
Offers an excellent educational department for percussionists offering lessons, exercises and trainers.

Woodwind Fingering Guides
A complete list of fingering charts in full ranges for all woodwind instruments.