This new high-capacity server world opened during the Dungeons & Dragons Online®: Eberron Unlimited™ Head Start at September 1, 2009. The name comes from the famous Dragonmarked noble house in Eberron, House Cannith. It opened exclusively to VIPs on the 1st day, and then opened to all Head Start players the day after.
Being one of the newest servers is recommended to new players as there should be relatively few "server full" errors unlike some of the more populated servers.
Official announcement: http://www.ddo.com/news/602-new-server-to-open-for-head-start