UbuWeb, the 20-year-old website that collects the forgotten and the unfamiliar
slate.com
slate.com
IMHO some modern discovery features such as tag clouds, multi-category ontologies or a custom search could really keep eyeballs, especially since huge numbers of recent uploads are films and the collection spans other media.
Then again, the site's own aesthetic seems to be anti-fluff, so perhaps that's supposed to be part of the attraction.