One of the things I missed most from my days at MS was StyleCop - a simple (internal) tool to make following coding guidelines second nature and end all (read: "most") arguments about whether your constants should be uppercased or not (etc). In a nutshell StyleCop plugs into VS.Net and gives you build errors if it detects your code is not conforming to the configured coding standards - simple. A silver bullet for enforcing coding standards across a team.
It's been more than a couple of years since I moved on from MS, but in May they finally released it to the masses (thanks to Howard for the heads up on this). There seems to have been some confusion over the naming; initially being released as Source Analysis and then reverting back to StyleCop hence URLs still refer to Source Analysis.
More info here:
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