THEORY
Worksheets on scales & intervals. You must be able to download PDF files. http://www.colby.edu/music/saunders/MU181/

25 free lessons with quizzes to download, http://www.musictheory.halifax.ns.ca/lessons.html

Ear training, theory and a very useful chord calculator! www.musictheory.net

GAMES
Go to Games & Quizzes link for flashcards on intervals and also ear training drills. http://pedaplus.com

Drills history and theory. http://library.thinkquest.org/15413/games/games.htm

SONGS
Songs for voice class. It looks like most of these are taken from the Clifton Ware book. http://music.wcu.edu/choral/VoiceClass/index.htm

PIANO MUSIC
Midi files of over 600 teaching pieces. They tend to be a little on the fast side, but at least it will give you an idea of the sound. Some files are better than others. http://pianoeducation.org/pnomusic.html

http://www.kenfoster.com/Articles/PracticingTechnique.htm