We have talked about it. Two of us found lulu.com, which looked promising.

I think the initial goal would be to make the book available online for people who don't want to buy a book, for whatever reason.

Like the WikiBook, but developed by DV. As an aside: the WikiBook has both good and bad features. E.g. it has a good comprehensive survey of different techniques. On the bad side, it starts with an 8000 word "disclaimer".

I would expect people who do want to buy a book, to look at Laberge's books first. But publishing on lulu.com (for example) couldn't be easier - free, almost no setup, unless you're publishing for profit you don't even need a bank account or anything. I didn't quite believe it until I tested it with a random text file on my computer. So we wouldn't lose anything by selling it as a book even if no-one bought it :-).