The 71 Ways to Monetize Digital Content
The definitive(?) list from Slate's former EIC, David Plotz.
David Plotz, EIC of Slate until earlier this summer, has a few suggestions in case you think you’ve hit the wall with monetization.
Not all of them are for everyone—a bunch require scale ("Ad network ads") and/or serious investments ("Conferences"); a few depend on the content you produce ("Higher end specialized product"); and some are just weird ("Cruises for readers")—but it’s a good starting point for anyone looking around for ideas.