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Visual Studio often does poor reformatting (Ctl-K,D) and there is limited control over options.
An alternative re-formatting engine (ideally intercepting the Ctl-K,D keystroke) with rich options would be sweet. Especially if it shipped with a variety of canned-groupings...
For example, Ctl-K,D will cause code to break StyleCop in a few cases (The heads of the Microsoft Hydra communicate poorly).