While I was playing with Visual Studio 2010 I ran across a cool little feature that I assumed was new to the VS2010 editor but turns out to also be available in VS2008. When an IntelliSense window opens there are times when you need to quickly see something that is underneath it. To do this all you have to do is press and hold the CTRL key. This will cause the window to become transparent until you release the key again:

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