I use StreamingVideoProvider

I use StreamingVideoProvider and could really recommend them.I mainly use them for live streaming. They have many advantages as a streaming company like highly secured streaming, Pay-Per-View system with no commission on sales, really good IP White / Black listing feature, as well as Geo Restrictions and Domain Restrictions. This is at least what I use with them for selling my tutorials. You can check them:
http://www.streamingvideoprovider.com/video-cdn-live-streaming-cdn.html