Microsoft SharedView
Another beta in the Windows Live suite from Microsoft, SharedView (beta) is a program that allows you to share a view of any program with others over a network. It allows you to share any currently open program with people using other computers.
Before you can share a program, it is necessary to start a session; you can invite others by email, IM, or phone to your session, or you can start a session without inviting others and invite them later.
Once you have started a session, SharedView displays a menu bar accross the top of your screen that allows you to control your session. From this menu you can select which program you would like to share; you can also see a list of all session participants; add a handout document.
You can prepare handouts. You can also decide who has control of the shared window, so that you can allow a colleague to control the mouse in your application.
You can try it out by downloading the beta at Microsoft's live.com web site.