I've been playing with Joel Fjordén's Code Style Enforcer
recently, and reckon it's one of the smallest, simplest and most useful VS IDE plugins around.
It's basically a DXCore plugin that redlines (draws a hand-drawn red line underneath) any c# code that doesn't meet the basic style guidelines from the iDesign C# coding standard.
I have to admit that finding the right properties page for the plugin to let me customise the rules too a while (find it by selecting DevExpress -> Options -> Code Standard -> Name Rules from the VS menu), but now it's great - I get instant feedback when I'm not meeting the basic coding standards.
Find it here...