>Hi,
>
>A customer mentioned to me that they would like to improve security of my ASP.NET application by adding the "capture" feature (this is what it sounded to me like on the phone). Has anybody done this feature? What is involved?
>
>TIA

I would recommend the Telerik Captcha control (not free) or this one: http://www.codinghorror.com/blog/2004/11/captcha-control-coda.html (free).