Well, I've got the prize in question, Scalable Internet Architectures by Theo Schlossnagle, which actually looks really good. Its a book that has come at a good time for me - I'm at a point where I can write a website in my sleep, but understand where the weak points are that might cause it to crumble under load is a whole new chapter.
Also included in the package were a set of trading cards from Zend Con '07 (here's the flickr set), with Cal's one autographed! Finally, and possibly most excitingly, I got an elePHPant! Here he is meeting tux:
Have a look at the other photos tagged with elephpant on flickr too!