If Java applets don't make you wince too badly, I have some interactive music theory concepts and drills freely available here: http://www.emusictheory.com/int

If Java applets don't make you wince too badly, I have some interactive music theory concepts and drills freely available here: http://www.emusictheory.com/interact.html http://www.emusictheory.com/interact.html and here http://www.emusictheory.com/practice.html http://www.emusictheory.com/practice.html I largely ran out of time to extend/improve it several years back, but it still gets quite a lot of use; students of subscribing teachers can use MIDI keyboards as well, which makes the instrument/theory link quite tangible.