The DimensionPatrol plugin helps you identify AutoCAD dimensions that have been manually overridden rather than containing the automatic measurement information. Potentially erroneous dimensions are highlighted in the chosen color (the default being red), for easy identification and correction.
This plugin was first published as an ADN Plugin of the Month: http://labs.autodesk.com/utilities/ADN_plugins. The plugin has been provided with the complete source code needed to build the application, with the intention of encouraging users of Autodesk software to use programming to tailor the products they use to their specific business needs.
More information regarding this plugin can also be found on Kean Walmsley's blog about AutoCAD programming, Through the Interface: http://blogs.autodesk.com/through-the-interface.