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The ControlFramework is a free .net 3.5 library that contains a number of useful controls and utilities.  This includes (not exhaustive): DockSplitter, DockPanelEx, Help, Rotary, TabPanel, FocusManager,....

UI Browser is a small, free (as in beer) utility based on the new UI Automation framework from Microsoft.  It allows you to browse and test an application using this framework.