Minecraft is a most excellent game about digging up cubes if earth and stone (among other things). It's like crack. Minecrack. I run a server for myself and some friends.
If you want full functionality of the Transporter plugin for teleporting between servers, you should download the latest version of the plugin and run it (double-click). Select your client's minecraft.jar file if it doesn't autodetect it, and click the "Patch" button. For teleporting between gates on the same server, the patch isn't needed.