Recently, I got tired of not having a solid list/historic of the movies and series I've seen.
With a few tricks, I started filling out this list and it was like when I first started using Calibre "How did I do without it all this time??"
Well, got very sidetracked from its use, but Calibre is so powerful and versatile that it handles it without a problem.
Thanks Kovid, and all the other contributors for this great software.
(note: I only keep the metadata, an empty entry for each movie, I don't think Calibre is optimized for big files. And even if it was, it would be a big problem of disk space)