Box UK, has a very complete survey of web business models. My concept of business models (though for information content and services, not just services) on the web was four: Free, ad-supported, subscription or some form of micropayment (Skype, I would say, is the largest user of this concept, though they pull it off a regularly replenished account).
This site expands that classification a bit, including things like taking payemnt for physical products and letting the service follow the product (which more and more electronics manufacturers do). What strikes me is that there really is nothing new here – all the business models have been around since time immemorial, something the media industries of the world should take note of.
The answer for more and more of the granulated information providers of the world lies in moving either towards the user (becoming, essentially, an integrated part of the user’s information need, such as Bloglines) or to step further from the individual information consumer, becoming a source of content for others to fight over. Paying a license, of course.
Anyway, a good list, and a good survey. Check it out.
(Via Chris Anderson of Wired.)