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Joel on Software
UML class diagrams
Visual Studio 2005 (Standard and above) have a built-in class diagrammer that's supposedly quite nice. Not exactly UML standard, though. You can get a free beta if you're an MSDN subscriber.
Doesn't Visio support some UML stuff? I haven't used it but I thought that the developer edition had some support for UML.
Oops... should have read the original post a little better. Visio probably won't take existing C# code and turn it into UML diagrams. Sorry.
Actually, there's a special edition of Visio that can reverse-engineer code... but it only comes bundled with Visual Studio Enterprise Edition. No idea why MS never released this feature separately.
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