Use an image map with a large clear area and a "SUBMIT" button somewhere in that area. Only accept submitions that include coordinates in that area. Move the area from one instance to the next. Pro: User doesn't even know they are doing it, Con: bot might randomly get it right, requires mouse click rather than Enter key.
Move captcha off the main page to a preview page with spell check, linkup and other services.
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<A HREF="http://www.piclist.com/techref/idea/website/captcha.htm"> Ideas for CAPTCHA's </A>
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