Source: http://lifehacker.com/#!5790347/youtube-adds-live-streaming-channel
While YouTube mostly serves up pre-uploaded videos for on demand viewing, they've streamed a few live events in the past, and today they started making it a regular occurrence. If you head to YouTube's new Live channel, you'll see a list of upcoming events that you can watch live, and chat with other YouTube users watching with you. Right now, they're rolling it out gradually, but quite a few popular channels are already streaming, like Hak5, Beyond The Trailer, and Geek Beat TV (pictured above). Head over to the Live channel to check out the upcoming events, and check out YouTube's blog post for more info.
