During my morning reading, The Long Tail had a link to a survey of Web app business models. If you take a look at the charts listing the revenue models, you will see there are twenty models listed. However, that is not an exhaustive list of ways to make money. Some of the models, such as Fixed and Variable Subscriptions, have several "implementations" that you can attempt. Having said this, why is it that monetization is so hard for many Web 2.0 applications? Let's look at what needs to be done to support the various business models.