I just finished reading Anatomy of Deceit which is an awesome study in how citizen journalism is necessary to keep both the government and the easily influenced media in check.
Marcy Wheeler writes about how bloggers scooped the media. The book combines the articles published on various political blogs to paint a vivid picture of what lead to the government leaks that lead to the outing of a covert CIA agent and the personal assassination of Joseph Wilson.
If you have any interest in political corruption, media studies, or, as is my case, anything CIA related, I highly recommend this book. It is a quick read at just over 100 pages with extensive notes and timeline if you are interested in the details.
The book was published shortly before Scooter Libby's trial, but you can continue to read about what is happening at The Next Hurrah.