Recently reading A Social History of the Media: From Gutenberg to the Internet
I like Peter Burke, a historian who looks at knowledge in many contexts : technological, economic and political. Here he describes the rise of the print media, showing the interaction with the continuance of other media (such as oral communication, handwritten letters, wood-cuts, religious paintings, statues, processions, medals etc.)
All fascinating stuff, and good to compare to discussions about blogs, wikis, social networking etc. and makes me think about their interactions with current events.