You can almost always get a signature from an author if you find them in person at a conference, Perl mongers event, or on the street, sometimes you don’t have those opportunities (especially since all of the authors are from the United States).
You can still get the signatures even without those opportunities. I have a limited number of “Authentic Author’s Signature” stickers from O’Reilly. If you send me a postcard with your address (here’s mine), I’ll send you one of these signature plates.
