to develop plugins for iTunes, VLC, Quicktime etc to auto-checkin movies that you watch
Nowadays a lot of users watch movies trough their PC or Mac that are ripped or downloaded on multiple creative ways. I would myself use this sort of plugin a lot since it could track which movies I watched and I would more often check back on gomiso.com if I forgot the name of the movie I watched recently.
Detection of the name of movies could be achieved by comparing the file-name or parent folder name to the databases of movies. Using the md5 of the file you can track as well other users that watch the same file thus movie.
This sort of service is already provided by an app I use to watch shows, called "TvShows".