I have written another wordpress plugin called Your Captcha Adverts which basically does what it says on the tin. It is a Captcha plugin for wordpress that asks the user to write an answer to something relating to an advert that you upload.

Features include:

• Support for Registration & Comment forms (Inbuilt support for adding more)
• Advanced advert display management (optionally set your own times and dates for on and off)
• Multiple questions per advert
• Accessibility support (alt tags and hint option)

We will be releasing it on or after 25/12/08 on Newmedias so keep an eye out and let me know what you think!