CR_MetricShader: is a free open source plugin for CodeRush or CodeRush Xpress which will allow you to see visually when your method's complexity is getting out of hand.
It alters the background color of your method to indicated severity with respect to your chosen Metric.
Works with the built in metrics of CodeRush (and the hidden ones in CodeRush Xpress) aswell as being compatible with any you might choose to create yourself.
