a social networking site in which BBC offers cultural reviews, with clips, and readers comment or write alternative reviews; readers also submit own reviews
a very large historical archive, often from advertising, "to provide for all levels of possible viewer a visually orientated taxonomy of the ways in which pictures are used to tell stories." unique collection, also useful for many other purposes
It's a query that garnered 135 comments and added film titles within ten days. It lets me think MetaFilter might be fun for students, to craft media-related questions that would get lots of responses, simple queries like this one.