Have you seen the board game "Settlers of Catan"? Our friends Nathan and Rachel introduced us to it, and my kids are hooked. We borrowed it from them for two months this fall, 'til Gramma and Papa gave it to them for Christmas. It's a strategy game for older kids and adults. If your kids like strategy and they have a good attention span, you should check out this game. Beware - you might get hooked!
Do you have other favorite games for kids ages 10-15?