Here's a few links to sites which have software to help you study music, I found them very helpful and thought it may benefit some of you...

Noteable: Learn to sightread and it records your progress over time
http://www.noteablesoftware.us/

EarMaster: Aural training software:
http://www.earmaster.com/

SmartMusic: Check out the site for more info
http://www.smartmusic.com/asp/SMS_home.pl

Peter