+2
Don't laugh, but try Amazon? Searching for a movie product usually gives a section "Customers Who Viewed this Item also Viewed" down the page a bit. For me at least, if someone is searching the name of a movie that I'm looking for I can safely trust their tastes in other similar searches they have also made.
If you search specific under the Movies topic, there's a "Customers Who Watched this also Watched" list. I just searched for Rubber (2011) and got back a list that contains Special (2006), Mother (2010), The Signal (2008), and Eden Log (2007). I think those would be reasonable branches from where I started.
Not quite what you're looking for I guess, but still fills a similar need.
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