Screen sharing apps are commonly used in business meetings where people aren’t sitting next to each other in a boardroom. Another use I have for them is in technical support for software where your client shows you on their computer what bug they discovered in your software.
The screen sharing compiler can be found at www.skype.com/interviews. I’m guessing by the name its meant for job interviews but there are other uses as well, such as students helping each other code.
This is a very useful site and it will probably wind up in the Skype application itself. It will run much better as an app than a web site when it comes to streaming audio and video.