We now have an online map of the Minecraft Worlds in our server. The maps get updated every day around 6:30am (Central Time), so expect the server to be a little slow during that time.
Here you can see a map of our worlds: http://zoomcat.no-ip.org/multicraft/map/ (Use the select box at the upper left to select a world).
Unfortunately there isn't a way to rotate the world or anything like that. Just zoom. I'm using the Minecraft Overviewer.