Well, this was bugging me so i've written a little prog. to handle tidy up movie files. It'll create a NFO file for each movie plus you can grab images off the net and use them as the thumbnails in xbmc.
grab it here
you'll need .net framework 2.0 to run it and it presumes that all your movies are in the following format;
main movie folder
--> movie name as folder
sorry that looks bad, can't get any indenting to work on this blog. :-(
i keep my file names matched to the folder names apart from split files. Let me know your thoughts. I'll be happy to pass on the source code if you want to expand it.