Ask HN: What revenue sources exist for content based sites?

I have read the techcrunch teardown (http://techcrunch.com/2010/10/10/teardown-13-ways-10-million-revenues/) and I understand ad-supported sites are very tough to execute. However, if one were contemplating running a content site, what sources of revenues exist ? How do you go about it ? Any ad network and affiliate network you would recommend ?