The "catchword" function
in the older version there were the descriptive words people could submit which would appear larger or smaller depending on the number of people who'd added them which could then be clicked to find movies matching the same words. While it was a little messy I found this function very useful for finding movies beyond the simple "similar films" function.
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Thanks for the feedback. The feature is called tagging, we are planning to roll those features into the preview version soon.
Also see: http://movielens.uservoice.com/forums/238501-general/suggestions/5450064-movie-tagging