I just saw Lasso Golf on sale at a sporting goods store.
Turns out they have it at Walmart. I had never heard of it, but the generic name is Ladder Golf. here's the wiki on the history:
http://en.wikipedia.org/wiki/Ladder_GolfBasically it's a bola, two golf balls connected with a piece of cord, and a ladder shaped target.
Maybe this post could have gone on the the primitive weapons page, but I was thinking something like this might be useful for short range form practice with the sling.