Taxonomy of Business Models

I discovered a very useful work of Michael Rappa on Taxonomy of online business. The professor outlines 9 key models:

1. Brokerage
2. Advertising
3. Informediary
4. Marchant
5. Manufacturer
6. Affiliate
7. Community
8. Subscription 
9. Utility

While in reality there is usually a mix of few it is quite useful to understand each of them. More on this here