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I've long used YAMMM for pulling metadata and thumbnails of my films/rips now i'm in trouble since switching as i can't seem to find any equivalent, The XBMC scrapers have been a disaster (e.g. I ripped toy story 2, put it in a folder "Toy story 2 (2000) and it pulled everything for toystory 3)
When I was using MythTV it seemed to do a reasonably solid job of pulling metadata and thumbnails, even for my Korean soap opera. However I don't really know enough to tell you which sub-package does the actual scraping.