This is my new testing book to devour: Testing Applications on the Web: Test Planning for Mobile and Internet-Based Systems.
It's a big book but I'm hoping there is a ton of useful information. I just finished James Bach's Secrets of a Buccaneer-Scholar, check out the review here. Before that I was reading James Whittaker's How to Break Software Security, which I also need to write up.
Soon I'll get all the review posted here!