Last week I needed a tool that would let me and a client view the same computer screen remotely. I found a great tool using the Blandin Toolkit: http://broadband.blandinfoundation.org/toolkit/applications.php
CrossLoop http://www.crossloop.com turned out to be exactly what I needed. My client and I each downloaded the software. It was free and easy. Because we each had the software downloaded either of us could share the view of our desktop. One of us just needed to share our unique code with the other. (The code changes per session.) Once I got her code, I entered it into the software. She got a message saying I was looking to connect with her. She approved my access with a click and then I could see her screen. It would be the perfect solution for a one-to-one demo or tech support.