Thanks for the encouragement. It's what drives the project. I'm thinking about offering some of the RailsApps advanced tutorials through a subscription site to support the project.
For most things, I want to know:
1. What are the pieces?
2. Where do they go?
3. How do they interact with eachother?
When implementing payments into a site (which is a core concern for the business/application), I'd like to know each answer in pretty good detail, so I'd be more than happy to pay $15-$40 for an ebook which will hold my hand through the "best practices" to those 3 answers.
Thanks for detailing the price range you'd pay. I ran some pricing tests (for a different tutorial) and compared offers of $9 for an ebook versus $19/month for a subscription-based online tutorial. Both offers performed well.
Maybe contact the pragprog [1] guys?
[1]: http://pragprog.com/