It looks like it's finally official and I can publicly announce it. I'm listed as one of the authors of Perl Hacks, with chromatic and Dr. Damian Conway. Oddly enough, I hadn't expected this. When a call for contributions went out, I just contributed a bunch. O'Reilly contacted me out of the blue and asked if I wanted my name on the cover. Interesting way to become an author, eh?
(To forestall the obvious question: yes, there are royalties, too)