This website has a decent amount of information about blogs and the internet. Shirky has a varied and long background and has been on the forefront of emerging media. The website is very up to date and is a good place to find out about the different forms of open source media and their influence upon culture.
This book is a compilation of many articles concerning blogs. After tracking down a copy, it seems to have a huge amount of information about the influences of blogs upon American culture. With a variety of articles, culture and politics come up in varying degrees. A great place to find out some more detailed information about the influence of blogs upon the American populace.