There's a nasty bug in the Visual Studio 2008 SDK browser (i.e. the app you can use to browse the samples, etc...) which can cause it to not be restored from "minimized" and/or cause big ugly red "X"s all over the place.

This will be fixed in the next release of the SDK. In the meantime, if you hit this problem, you can workaround the bug by running the following from a command prompt:

"%VSSDK90Install%\SdkBrowser\Microsoft.VisualStudio.Sdk.Browser.exe" /reset