If you followed this blog for a long time, you might have seen my post about introducing reCAPTCHA (Added reCAPTCHA to webeno contact forms). Let me tell you something: you don't need any sort of captcha trick at all in order to prevent SPAM! And believe me when I tell you this as I have this new way setup and working perfectly, and have received 0 automated SPAM through my forms since its introduction!
Here is what I did:
