ShowMyPC

ShowMyPC combines VNC remote access technology with an open-source SSH forwarding client to provide you with the option to allow other users to view and control your desktop. The remote user needs to have the ShowMyPC software installed and can access your computer with just a password (no IP address needed). The temporary session password is automatically generated when you start the viewing session and must be provided to the remote user by email, phone or other means. If you have access to your own SSH server, you can use it instead of the one provided.

http://showmypc.com