Quick Survey: Coverage metrics

Hey folks,

I'm taking a quick survey.  If you are currently using code coverage metrics in your project, which kind of metrics are you using and as a bonus, how do you decide what percentage is acceptable and are you satisfied with the metric? 

By coverage metrics I mean: block, arc, path, line / statement, branch, MCDC, condition, etc. 

You can leave comments or email me at scarroll at microsoft dot com.  I'm collecting this information to help us determine what our customers want in later versions, so thanks in advance.