business webinars
http://blog.getsocial101.com/usinggooglehangoutforwebinar/
You are able to broadcast your Hangout publicly. You are able to record it, edit the output, and share the recorded event online.

There are tons of ways for small businesses to employ hangouts to connect with their customers, construct their brands, monetize their businesses, and create buzz.

You might have a big announcement – a new executive, a new product, or to announce that you have won an award, hangouts let you announce to the whole world and keep an interactive record of the event.
Using Google hangout for webinar

Press conferences Taylor Swift aired a hangout to announce her latest album. As soon as her single was released it went directly to number one, more quickly than any other song in history.

http://blog.getsocial101.com/usinggooglehangoutforwebinar/

related host webinar videos
http://youtu.be/W_0heAbcpms