I have just released the AntispamValidator control. AntispamValidator control is an asp.net validation control that can be used to prevent posting of contents that contain lots of links. Spammers like to post contents with lots of links to increase the Google ranking of their sites. The control can be downloaded from
http://www.dotneteer.com/downloads/AntispamValidator.zip. You might also visit
http://www.dotneteer.com/projects/AntispamValidator.aspx and post a content with lots of links to see if in action.