A while back I mentioned a Java application that searches for code duplication called Simian.   I have noticed that the latest build of CruiseControl contains tasks for including Simian output in your cruise project dash board.   Also, Darrell Norton has just posted about an article on setting up Simian to detect duplicate code.  Then he talks about MonkeyWrangler.   MonkeyWrangler is a Visual Studio Add-in written by Howard van Rooijen which takes the output from Simian and formats it so you double click it from the output window and it will take you directly to the line where the duplication occurs.