Fred Wilson starts a new series of posts on revenue models:
I will kick off this series by making an important point about focus. I strongly believe that entrepreneurs should pick one revenue model to start with and focus 100% on making that work before rolling out another one. It is very hard to execute two or more revenue models at the same time. Better to nail the first one before rolling out the second.
With the help of his readers, he pulled together a thorough list of revenue models and examples, an invaluable resource for people thinking about or working on monetization challenges.