White is a testing framework for the UI layer and supports Win32, Windows Forms, WPF, and the SWT java framework. For those of you who may be surprised about the java framework part of SWT, I’ll let you know that this is possible because SWT is actually implemented using native UI Widgets on each platform it supports. Since native code is being executed, I would presume any testing framework that works at the Win32 level would also work on SWT.
The thing I really like when I first look at White is the syntax and the apparent support of non standard UI controls. The main drawback I have seen with other attempts at UI testing frameworks is that they do not easily accept controls that are not shipped with Windows Forms.
The CodePlex site has some samples and a link to a good getting started tutorial.