Really liking MC.
Have you put any thought into looking at My Movies and how it cataloges movies, especially around the extended information, like disc information etc? It's also able to distinguish between different versions of the same movie.
Even better, what about a converter that takes the mymovies.XML file in each movie directory and creates an XBMC NFO file from it? I imagine this would be some form of XML transform to match the tags between the different formats. I would love to switch over to XBMC with my next HTPC, but struggling with converting...