Yeah I thought about that too. CAPTCHAS are a bitch and would require a complex OCR, but I've heard of some opensource ones and I have code to one I could maybe implement...
Don't even bother with that, mate. You will never win. Just output the CAPTCHA - typing only it in is easier than making the whole post isn't it? And of course, you may find some CAPTCHAs that are really easy, that you CAN crack with OCR. Just keep it nice and simple.
