The following short, instructive video is about how you can broadcast your PowerPoint 2010 presentation over the Internet to a remote audience. "While you present the slide show inside PowerPoint, your audience follows along in their browser -- they don't even have to have PowerPoint installed."
Broadcast is a really cool feature, here are just a few more quick examples that can help you learn more:
Share presentations painlessly with Broadcast Slide Show:
Broadcast your PowerPoint presentation to a remote audience:
Out of Office, Casual: PowerPoint Broadcast over any device: