Skype is so popular among Offbeat Brides that we have a whole tag archive for it.
Like Skype, Google Hangouts on Air is free; unlike Skype, you don't need to upgrade to have conference calls with multiple computers.
If you set it to unlisted, anyone you give the link to will be able to watch the stream live on You Tube.
You Tube Live saves the broadcast as a video and posts it automatically to your You Tube page (you can set the privacy for this, too).
Amanda and Jason live-streamed their elopement using Skype, and so did Andy and Cassie.
If you have a Mac Book, i Pad, or i Phone, you can set up a video call to another Apple Face Time user.