I presented on the OWASP ModSecurity Core Rule Set (CRS) Project yesterday here at the AppSec DC conf. The reception was good and there were a lot of great questions. For those interested, the PPT has been posted to the project site. It gives a good overview of the CRS - http://www.owasp.org/index.php/Category:OWASP_ModSecurity_Core_Rule_Set_Project#tab=Presentations_and_Whitepapers