Writing Visual Studio App.config [closed]

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I recently found myself writing some XML in my Visual Studio 2010 Project's App.config file.

The values I used were assemblyIdentity and bindingRedirect - neither of which show up using IntelliSense.

I'd like to know some cool tricks that other developers have come up with to use in App.config - a file I rarely touch.

There's a document on MSDN (+1 for other links), but it (most likely) will not go into detail on how to do some trick stuff.

[Update]

Due to the fact that Joe, djacobson, Henk Holterman, Mark Biek, and Neil Knight collectively voted to close my question, I've decided to post a couple of examples of the kinds of info I'm looking for:

• Hidden Features of开发者_开发技巧 C#?
• What are the lesser known but cool data structures?

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Something to start with: http://blogs.msdn.com/b/vsto/archive/2010/03/09/tricks-with-app-config-and-clickonce-deployment-saurabh-bhatia.aspx