Web Revenue Models
There's a best practice acronym for creating lists like this - MECE: mutually exclusive, collectively exhaustive.<p>I'm not sure this list passes the "mutually exclusive" test - for example, eBay fits into both the "marketplace" and "auction" category. "Freemium SaaS" is clearly a strict subset of "SaaS". Might seem like a minor quibble, but a categorisation system isn't very useful if the categories are all jumbled up.