There was a time in the not-too-distant past when large companies and powerful governments reigned supreme over the little guy. But new technologies are empowering individuals like never before, and the Davids of the world-the amateur journalists, musicians, and small businessmen and women-are suddenly making a huge economic and social impact.

In Army of Davids, author Glenn Reynolds, the man behind the immensely popular Instapundit.com, provides an in-depth, big-picture point-of-view for a world where the small guys matter more and more. Reynolds explores the birth and...