Some cool links for your viewing pleasure

Flash Piano – Play pitches on the virtual keyboard!

 http://numbera.com/musictheory/piano.aspx

 

Metronome Online – Very cool and functional metronome!

 http://www.metronomeonline.com/

 

Audacity – Free cross-platform recording software.  Very useful and reliable.

 http://audacity.sourceforge.net/

 

Exploratorium – Science of Music

 http://www.exploratorium.edu/music/index.html