It's a typical Rails 3 apps, Nokogiri used for scraping, PostgreSQL db (migrated from SQLite originally), jQuery+ui for the aucomplete (lazy, yay!), and that's about it :)
Impressive. Your autocomplete suggestions are high quality, even in foreign languages. May I ask how you are ranking suggestions results? It can't simply be the TMDB api, right?
What are the technologies involved ?