This free ear training site helps you to develop good ears. Java Music Theory Multimedia Music Theory Tutorial Music Theory Page for ChordWizard - a powerful software tool for working with chords for guitar, banjo, mandolin, ukulele and other instruments Music Theory Instruction Reviews Reviews of the best music theory training available online. An interactive internet course for learning music fundamentals. Designed to be a high school AP course or freshman college level remedial theory course. The Musical Intervals Tutor is an interactive site that will help you learn the basic music intervals from minor second through perfect octave.
Site also includes staff and ear trainers for improving musicianship.
Polytonic Harmony Practical Music Theory web site dedicated to the study of Musical Theory Rhythm Exercises Nicks pages about his music and whatnot. Contains rhythm exercises, drum lessons, gear, and news.