I am trying to find out all the oEmbed providers out there. I went to the oEmbed spec site and they have a few, but I found out a few other that weren't specified, like 5min video:
Provider: 5min
URL scheme: http://www.5min.com/video/*
API Endpoint: http://api.5min.com/oembed.{format}
Docs: http://www.5min.com/APIDocs/Embed.aspx
Nothing better than to ask the developer community in StackOverflow.
Embedly looks to have a good collection: http://api.embed.ly/