[swombat]

There are far more than 3 business models online.

Here's a brief list of 9: http://digitalenterprise.org/models/models.html

[edw519]

Where would salesforce.com fall in that list of 9?

[swombat]

I think it doesn't, actually. It's sort of in between the subscription model and the utility model. Which goes to show, there's more than 9 - so the reduction to 3 is a little absurd.