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Here’s a useful guide for everything related to Web caching. Webmasters inevitably have cache related issues at some point in time. The author describes different types of caches and how to control them.
Thomas Vander Wal has a great post in his blog on social interaction with technology, which he refers to as technosocial. His perspective is that there is a gap between what information and when people need information versus what techologists provide. In my full-time job I am responsible for implementing Web metrics and it is always surprising to see how much information people *want*, but then never really look at or understand. 
We (as designers and developers) focus on making our technology easy to use and providing a good experience in the domain we control.
People want to use the information when they need it, which is quite often outside the domains we as designers and developers control.
Technosocial Architect – vanderwal.net
TechToolBlog has a huge list of free on-line programming books. The list inlcudes books on: Assembly, C++, C#, CGI, COBOL, Databases, Delphi/Pascal, Fortran, HTML, Java, Javascript, Linux, Lisp, Perl, PHP, Python, Ruby, Samba, SQL, UNIX, Visual Basic and VB.net, XML
One of the comments on the list recommends techbooksforfree.com,which also has a great list of downladable books.