Yep, its the old David and Goliath kind. Someone here got me started on them. These things are freaking addicitive. At the risk of cross forum posting, here's a tutorial on the one I made. I also have 2 that are just leather pouches and paracord. I like the woven ones better, but the leather and paracord will throw just about anything, and I have. Heavy hex nuts, rocks, golf balls, tennis balls (great with dogs), bolts/allthread with 3 or 4 nuts locked on, rubber bouncy balls, toilet paper rolls, plastic easter eggs, hackey sacs, nerf footballs, those middle school rubber dodgeballs, etc.
Braided/woven sling
http://slinging.org/index.php?page=how-to-make-a-rockman-sling---bruno-tosso
Leather pouch and paracord
http://slinging.org/forum/YaBB.pl?num=1235334392
The braided slings I made use jute twine, mason's twine, and nylon. The nylon is too stretchy, but with a red and black thread, its the best looking one I've made.
I rehandled my throwing cleaver in walnut and repaired/sharpened the edge. It was the first knife I ever sold. Also the first that had a handle on it that looked the way I wanted.