In this book, you are shown examples of how to do all the things we discuss on an active web site (www.opensourcewebbook.com/) so that you can see the code and the results, and be pointed to additional resources. We're striving to be self-contained, but we like books, and often tell you which other ones you might want to look at. The entire web site can also be downloaded from www.opensourcewebbook.com/sourcecode/.