Other
Piano Music Sight Reading Practice
Actually this clever site drills pianists on note names and note placement on the keyboard. Kids can access this site at home for practice. Both treble and bass clef are used.
Other
Music Theory First Aid for Struggling Students
This site provides music theory information on such topics as rhythm, intervals, scales, chords, etc. Also, there is a fine section which describes the basic concepts of form and structure.
Music Theory
Music theory.net
An online beginning music theory and ear training site. This site is for students to use at home to reinforce what they learn in class.