Learn about Rhythm
www.FundamentalsOfMusic.com A website that teaches the fundamentals of music, including sound, rhythm, melody, harmony, and form.
Practice tools and online metronomes:
Simple clicking metronome
Sleigh bell metronome
Talking metronomes that speak the beat
Metronomes in different meters
Turn your mp3 player into a metronome
www.Soundation.com - An awesome online digital audio workstation with built-in software synths and the ability to record audio and midi.
www.bulletproofmusician.com - A great music performance blog
TheClarinet.net - scale sheets, free clarinet, and educational tools to help you become a better clarinetist
Clarinet Space - loads of educational tools with scale sheets, pitch name games, and much more
Clarinet fingering charts - the easiest to use and understand clarinet fingering charts on the web.