WANem is a great free tool over at sourceforge that simulates a wide area network. This tool comes in handy when you want to see how an application is going to perform on a wide area network. WANem allows you to simulate network delay, packet loss, packet corruption, disconnections, packet re-ording, and several other characteristics. You can currently download the program as a live cd or a virtual appliance for VMWare. Check out this great tool and let us know what you think.
WANem Sourceforge Link