TrafficMap is PHP script to show network topology in webpage. It reads TkInEd .tki files and shows PNG images (or GIF, depending on GD library installed). It can also make HTML page with imagemap where you can click to the node icon to telnet it or move over link and see bandwidth usage graphs for example. Demo images (hostnames removed)
Try to move mouse over a1-POP1 and gigabit connections between s1-POP2 and s1-POP2