This is by far the best looking CAPTCHA I have encountered in the Internet. The Ajax Fancy Captcha from Web Design Beach is a jQuery plugin that helps you protect your web pages from bots and spammers. A new, intuitive way of completing verify humanity tasks features dragging capabilities in order to provide the correct answer rather than typing in letters of words.
And you do not just drag about anywhere. You have to drop it within the circle provided where it says DROP HERE.
Its basic design and elements are easy to change and customize to fit your site’s theme. This is FREE. I repeat, FREE ;).