I've finally updated the server to 1.7.2, it's taken a long time for the bukkit people to get working builds out for this version as it's the largest update to date, in terms of internally changed code. Also the beta builds are still somewhat problematic, in terms of stability, game bugs, and memory leaks.

I've created a new world for this update and made it the default world, the world is named worldv3, You can get to it like the others by doing /warp worldv3 on the server. Also I plan on eventually retiring the cartsworld world on the server, stuff there will have to be moved over to the other worlds. If you want something moved from one of the old worlds to the new one you can ask an admin to move it for you.