List of Interactive Websites:
Flashmusicgames.com games for piano, drums and guitar
Live Binders for teachers and musicians who want to organize files and stuff.
Melodystreet.com world of instruments
mgslyon.wikispaces.com for brain games and fun stuff
Music Ear Trainer
Oceanhousemedia.com for tons of apps
SFSKIDS.org fun music lab for kids
SMART Music Teacher
Sphinxkids.org classical music fun interaction
These are a few of the fun places I like to visit in my free time.
Hope you find them helpful!
"The beautiful thing about learning is that no one can take it away from you." B.B.King