A pretty exciting project went up on Codeplex called Win32HostRenderer  that "defies" the airspace rules of WPF.  Quoting from the project, " Win32HostRenderer is a WPF control that will host a Win32 control and render it onto a WPF bitmap buffer allowing you to interact with the control and apply anchors and other sweet WPF trickery and magic.  It works with 2D and 3D viewports." There is a warning associated with the project -- "The control is still highly in prototype mode and It doesn't really work perfectly just yet" -- but nonetheless it represents some exciting work that many may find useful.