This article http://www.newsweek.com/id/183666 is from February's Newsweek magazine.  The author claimed: "I learned the hard way: while blogs can do many wonderful things, making huge amounts of money isn't one of them." It is also interesting to read the comments of the article.
WildGrass on January 8th, 2009
(Fortune Magazine) -- Financially speaking, Web 2.0 has been a total bust. Social-networking companies such as MySpace and Facebook have loyal fan bases, but they're not exactly minting money. --> http://money.cnn.com/2009/01/07/technology/hempel_threepointo.fortune/
Web 2.0 and free are kaput, Next - the smart, distributed, transparent Web, see full story ...