LIVE or pay-per view Online Video platform

http://www.dacast.com/

http://www.udemy.com/courses

http://www.ustream.tv/

Google launched the Hangouts On Air in Google+ (plus the YouTube)

No limit to number of audience, it offers the LIVE video broadcast (in Google + and in your own website)
When the video session ended, It will create the video archive in Youtube for you.

Intro video