best software for webinar
http://www.blog.getsocial101.com/usinggooglehangoutforwebinar
You are able to air your Hangout publicly. You are able to record it, edit the recording, and share the recorded event online.

There are tons of ways for even small businesses to employ hangouts to connect with their customers, build their brands, increase profits for their businesses, and create excitement.

If you have a newsworthy announcement – a new hire, a new product, or to announce that you’ve won an award, hangouts let you tell the world and have an interactive record of the event.
Using Google hangout for webinar

Press conferences Taylor Swift aired a hangout to promote her latest album. When her single was released it went directly to #1, more quickly than any other song in history.

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

related online webinars videos
http://youtu.be/cMTSV2XYYlQ