Currently i’m working on integration for our software TubeBox (was mine, now sold, whatsoever). TubeBox is search / download / convert tool for video sites like YouTube, Vimeo, Metacafe, etc.
And every time you start implementing a new provider you cross your fingers and search for “[Provider-Name-Here] API”. Most providers have beautiful Web 3. 0 sites and offer a public API to create mesh ups and get more reputation.