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Tag-exploring page like the Movie Keywords Analyzer (MoKA) http://www.imdb.com/Sections/Keywords/

Added on May 15 8:32

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With MoKA, you enter a tag and get not only a list of movies with that tag but a list of other tags that those movies also contain, any of which you can click on to change the search to include only movies that contain both tags, and you can keep refining your search in this way.

This Greasemonkey script highlights all the ones you've rated:

http://userscripts.org/scripts/show/36797