Jamie Cansdale's done it again- he's added Test With -> Coverage to the TestDriven.NET Visual Studio add-in. A picture's worth 1,000 words:

Once the tests are run it launches Grant Drake's (aka KiwiDude) re-write of Jeff Key's NCoverExplorer. The NCoverExplorer then displays full coverage stats as well as illustrating the coverage of code blocks. Here's the output from a run over the NUnit code:

This is awesome work that will make it easier to understand and work with code.