Advertising Is Not a Sustainable Business Model for the Web(amitklein.com)
amitklein.com
Advertising Is Not a Sustainable Business Model for the Web
http://amitklein.com/2009/05/31/advertising-is-not-a-sustainable-business-model-for-the-web-unless-you-are-a-search-engine/
(Though this doesn't detract from the rest of the article, which covers alternate business models.)