Here is search logs of 650,000 AOL users. It's very interesting to view search history of particular person and analyze his personality. Let's do it together! Read more about AOL search database scandal or view research papers on web searching.
rhodesmill.org
This book covers a wide range of topics. From raw TCP and UDP to encryption with TSL, and then to HTTP, SMTP, POP, IMAP, and ssh. It gives you a good understanding of each field and how to do everything on the network with Python.