Some times back I had posted about tools for converting SWF to XAML, where I had talked about SWF2XAML, a free tool developed by Mike Swanson of Microsoft and other tool called Harmony.
Recently I came across another tool TheConverted for converting SWF to XAML, which has support for converting animation and sound also. Check out the demo page which also compares XAML and SWF samples.
But these samples require IE to view online. If you would like to see specific file tested before purchasing, download the 60 day trial version.
UPDATE: Also check my related earlier post :Convert SWF to XAML