I have been doing a lot of reading in this area of the past several years and here are some of the best resources I have come across so far:

• Infotopia by Cass R. Sunstein
• Convergence Culture by Henry Jenkins
• Smart Mobs by Howard Rheingold
• Wealth of Networks by Yochai Benkler

Of course, you can always check out the patternhunter blog for more up-to-date news in this area.