[jtheory]

It's a good intro, and music theory is one of those things that's quite hard to introduce well.

I'm a music educator, of a sort; this is a project of mine, build around interactive drills & concepts (click free resources if curious): http://emusictheory.com

...but I've held off for a long time on writing a real online course, because, well, it's hard. The concepts don't always seem logical in isolation, the names of concepts sometimes overlap in weird ways (er, major 7th interval or major 7th chord?), and the general approach -- to lay down all the groundwork first, and only then get into anything remotely practical -- is deadly, deadly boring.

So I'm very much in favor of taking a practical approach, and trying to give the student something actual musical-sounding they can produce at the end of every mini-lesson... but if this were easy to do, I'd have it up on the site already. :)