I know there are alot of New folks to the Mac and might not have heard of this application called SPY. Its been out for a few years now.
It takes a picture of your screen and creates a website automatically and can be listed on the tracker if you choose so. It great for showing friends your screen, or doing presentations over the Web as it also has live video of your screen.
http://www.silvernetworks.net/ (currently the guy that runs it is remaking the site)
This app has a tracker that list all the screens that people have to show.
http://www.silvernetworks.net/products/spy/tracker.php
Here is another site a friend of mine did that shows all screens at the same time.
http://dettmer.maclab.org/spy/spyall.php