I'm currently working on a big project creating this Audio Engineering Course. It's a structured course, to take you from beginner to intermediate. And if you're already at an intermediate, or even professional level, there might some nuggets here and there of good stuff. My favourite lesson is probably Advanced use of EQ, there's some good stuff there no matter what level you are at. The course syllabus is already pretty much set in stone, I can always add to the tips and trips chapter, and the "How To's" chapter. Let me know if you have any ideas for topics I can cover.