Try YAMMM or Colbee - auto services that check files and folders as you add them to your library. http://missingremote.com/forums/yammm-beta-1310281336 - YAMMM http://www.collbee.com/en/ - Colbee
I'm using YAMMM personally, I just drop a file in to my library and it gets renamed and NFO, XML and fan art automatically...
I'm also using IMDB+ to rename the movies within MP correctly (to my taste).