PS: If your site is big enough, your "riddles" and their answers will probably be added to the knowledge base of XRumer and other spambots. But if you run a small site you will probably be able to fly under the radar for a long time with "riddles" you create yourself (and you just watch the logs and retire and replace any "riddle" that is cracked by a spambot).
* About DocRaptor. A client once asked me if she could save the whole website that we just built for them to a single PDF file, complete with spreads, blanks and high res images? In other words, replacing a corporate Adobe InDesign document that took for ever to update and that was costing them a fortune. How many of you think this is crazy? How many of you would take a crack at this project? Follow me on Twitter to find out what happened. 2b1af7f3a8