1.7 is coming this week, bringing pistons which open up a few neato possibilities if you're into building nifty contraptions and the like.
I'll update the server ASAP after it's released, but you shouldn't blindly update to 1.7 without checking this topic if you don't want to possibly be locked out of the server for a few hours or a day or however long it takes me to get a chance to update it.