Any way to add custom properties to the file properties grid in Visual Studio?

Question

In Visual Studio (specifically, 2008 and 2010), when you invoke the View.PropertiesWindow command (default key, F4) in a C# project, you get a property grid with a standard set of properties that apply to all project items.

Is there any way to customize that list of properties? Specifically, I'd like to associate additional information with project items which I later access via a Visual Studio extension (e.g. a custom tool).

Thanks in advance.