Came across this a while ago and I thought some here might be interested in it. I've been using it myself for about a week and I'm really enjoying it. If you have AD[H]D I would highly recommend it; or just for anyone trying to bulk up brain muscles for more disciplined concentration.
http://litemind.com/mental-sanctuary/ (http://litemind.com/mental-sanctuary/)
Awesome thanks for posting,
I'm always looking for new ways to strengthen my concentration :-)