http://www.highend3d.com/maya/downloads/tools/3d_converters/Maya-To-XAML-3782.html

I had a little trouble getting the plug-in to work on systems that don't have the Visual Studio C++ runtime installed but found a solid workaround.  I also added support for locators and a couple other minor features.  I was happy to find that the XAML format from WPF 3.0 is still compatible with 3.5.   

As usual, I appreciate feedback and debugging.  Let me know if you want to become a contributor on CodePlex.com and I will add you.  The version up on CodePlex now requires Visual Studio 2008 but if you need a project and solution to work with VisualStudio 2005, let me know and I will send it over.  I should have a sample Maya scene available for download soon so check back and enjoy!