Yeah, it'll be free. I haven't yet decided whether I'll be offering it just as web pages or as a downloadable package or both; a lot depends upon a bandwidth vs. demand thing with the hosting service itself.
I just thought that based upon both conversations I have had in the real world and my experience here online that compression is probably the most asked about and least understood aspect of audio engineering at our level. The answers to many of the questions really require an understanding of the principles and techniques that don't lend themselves well to the short form answers common to a forum, and it's obvious that "there is no good answer" answers are not satsfactory to either the questioner or the answerer.
After spending some signifigant time searching the Internet for a good source to turn people to on this subject, I found a lot of sites that provided some good thumbnails and basics, along with some that gave just plain bad or, at best, incomplete information, but I really have found nothing that I felt comprehensively and honestly discussed and explained the subject. So I decided to follow in Bruce's (Blue Bear) excellent tradition of writing an on-line treatise on the subject. Hopefully my little thing will be half as good as his contributions to the Internet knowledge base.
It's really turning into a mini-booklet as I'm currently up to about twelve pages and only about halfway done (not including graphics, which I still have to add.) So rather than have one big, long article that scrolls on forever, I'm turning ito a hypertext booklet with linked chapters and such to make it a bit more accessable and managable.
When I have the beta draft done; I'll be hitting up on a few pros to hopefully proof it for me and look for technical inaccuracies or omissions. Once that stage is complete, I'll make it available to anybody who wants to either read it or print it out and use it as toilet paper

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G.
P.S. The good news is that I'm writing it with a spelling checker, so my usual forum typos should be kept to a minimum here. 