Sure, sorry for the delay in response.
But for example if I am sharing out my desktop using Sharedview to another workstation, on that workstation they see my destop bordered by gray bars, so my 1024x768 shrinks down to fit within the gray. Allowing fullscreen sharing, so that they just see my entire desktop on their monitor with minimal commands to close, would help in situations where Sharedview is used for desktop support or remotely giving someone a walkthrough of a piece of software, etc. Those are things which I used to use netmeeting for, but since I've upgraded to Vista have wanted to use shareview for.