I\'m working on a quite large project, a few years in the making, at a pretty large company, and I\'m taking on the task of driving toward better overall code quality.
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Cyclomatic complexity is a decent "quality" metric. I'm sure developers could find a way to "game" it if it were the only metric, though! :)
And then there's the C.R.A.P. metric...
P.S. NDepend has about ten billion metrics, so that might be worth looking at. See also CodeMetrics for Reflector.
D'oh! I just noticed that you already mentioned NDepend.
Number of reported bugs would be interesting to track, too...