I do find it important to refresh my memory from time to time, even when it comes to something that I do quite frequently, like writing code. A reminder about why some things have to be done in a particular manner, re-reading the exact details about how to do something, or just brushing up on a subject supposedly known only to find that things have changed a bit in last few years: all good reasons to never stop reading.
That’s one reason for me to read “The Basics of Web Application Security” on Martin Fowler’s site. It’s also a good intro to newcomers in the field – and to top it off, it features an xkcd cartoon! What more can you want?
I’m waiting for further additions to this text!