TestApi is a collection of test and utility API's written to make testing WPF, WinForms, .NET, and Win32 applications easy.  I made some contributions to last week's release (combinatorial variation generation).  Also new is a fault injection engine.  Previous features have included:

• Command line parsing
• Visual verification
• Application control
• Several WPF utilities

You can check it out here:  http://testapi.codeplex.com/