Online video is hot and so are online video APIs. We recently added the Vimeo API to our listings and this brings the total number of APIs at ProgrammableWeb to 19 (see them all here). The king of these is still the YouTube API but for developers there are lots of choices.
Keek, social video network, recently announced the release of the Keek API. Alongside the API launch, Keek established a developer portal that includes tools and resources to assist developers in integrating Keek with third party applications. The Keek API grants developers access to public keeks (i.e. 36 second video updates), search, user profiles, klusters, and more.