I just received my copy of Essential PHP Security, which means it should be on shelves within a few days. I'm very happy with it, especially the size. Apple's iPod nano isn't the only thing that's impossibly small. :-)

A sample chapter will be available soon from MySQL's Developer Zone, and another chapter is already available from O'Reilly:

• Chapter 4: Sessions and Cookies (PDF)

I hope you enjoy it. Please buy a copy. :-)