During my surfing time I have discovered several books about the web, that - i think - are very influential. I make a list here, with the ones I found most intriguing and accurate. They discuss a wide range of topics, some of them really up-to-date.

1. The Cluetrain Manifesto. [C. Locke, D. Weinberger, R. Levine, D. Searls] A classic. Describes the changes the internet age is bringing to our lives. May sound utopic sometimes, but makes you see the web under another perspective.
2. Code 2.0. [Lawrence Lessig] That’s a must for anyone interested in the freedom of cyberspace and code. A great resource, especially after the latest stories on privacy and censorship. How data (and consequently code) constitute the law of the web.
3. We the media. [Dan Gillmor] How the blogosphere revlutionizes journalism and interaction in general. Although it describes services most of us are familiar with (RSS, Wiki, Blogs, etc), it stands as an advocate of an open society and the wisdom of crowds.
4. We think. Innovation by the masses for the masses. [Charles Leadbeater] A study on the collective intelligence, with numerous examples from BMX bikes to wikipedia. Discusses the motivation of the participators and the reason their innovations succeed.
5. Cascading Style Sheets. [Hakon Wium Lie] That is actually a PhD thesis. It poses an interesting analysis on a very popular web language.

If you have any addtional resources please let me know.