I don't know if this is a stupid question, but I keep going to servers, building cool stuff, and then a few days later the server is just gone.  I thought "It's All in the Mined" seemed pretty solid since it was a World of Minecraft server, but now it's gone and the server description doesn't even exist on the Minecraft forums anymore.  Can anyone suggest a server I should go to that is anti-grief and also won't just disappear?