Nothing, as of August 2001.  That's likely to change though.

Jon Udell "think[[s]] of WinForms as MFC (Microsoft Foundation Classes) 
for scripting."  http://msdn.microsoft.com/vstudio/nextgen/technology/winforms.asp has
Microsoft's own expression of the vision. (STALE, but see http://msdn.microsoft.com/msdnmag/issues/01/02/winforms/default.aspx - RS 2003-05-22)

Note that Ximian has committed to including WinForms (and ADO, too) as 
part of its .NET implementation (more than Microsoft itself has done).

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