@Ryan I just mentioned to Nathan Rice today that if he were to write a book on WordPress Development 101, I would buy it in a heartbeat. That would hold true even if it was a PDF version only.

I think there is money to be made in the support/knowledgebase subscription model. If I had access to well written documentation AND code examples, I would likely pay for that. Stuff like that is priceless for people like myself who are trying to learn WP as fast as possible.