I've been thinking about taking all the recipes for GNU Make things that I've written over the years as articles, or blog entries, or answers to people's questions on help-make and writing them up as an e-book for purchase and download from this web site.
Here's a sample recipe in PDF format so that you can see what I'm taking about.
So, the critical questions:
1. Would you buy such a book?
2. If so, how much would you pay for it?
3. What format would be best? PDF?