Twelve Tribes, the Commonwealth of Israel
This is a spiritual communal community to watch. They have communities all around the world with over 2,000 members. Most of us will not accept some of their views (anti-gay; "we are the only chosen ones" ideology; corporal punishment of children; women submit to male authority) but their success and growth has lessons we can learn from... In particular, perhaps, the importance of authority, leadership, and vision. Don't forget to check out twelvetribes-ex.org as well. The twelve tribes seem to be well-run and well publicized. Here's a story of my encounter with them on the Washington DC mall.