Design Quality Metrics for .NET Applications

I've been struggling with a concept at work. How to measure the quality of an application? It's typical to ask and there are some basic things you can look at, but for the most part you're doing code reviews or looking through architecture diagrams trying to figure out what someone built and is it good.

Now along comes NDepend. It analyses .NET assemblies and generates design quality metrics around them. You can measure the quality of a design in terms of extensibility, reusability, and maintainability. Prety nice stuff and of course, open source (yay for OSS!). You can check out the latest version of NDepend here and check out a sample report of NDepend run against NUnit here. Neat stuff.