TeamViewer
Teamviewer establishes connections to any PC or server all around the world within just a few seconds. It is the solution for easy and friendly desktop sharing. You can remote control a partner's desktop to give online assistance or to transfert files - all without worrying about firewalls, IP addresses and NAT.
An important innovation in TeamViewer 5 is the new VoIP (Voice over IP) audio and video capability. It enables you to talk to your customers for free and to give your sessions a more personal touch using a webcam.