Yup. I have one right now. I made the handle from a piece of oak. I'm throwing many different "darts" with it. I really like bamboo, since it's fairly rigid compression-wise and mostly straigth.
Don't underestimate how hard it is to actually make a good one. It has to be really straight, and your darts must fit very well, otherwise it's just not usable.
I practice with it pretty much daily, and with time I'm getting better, but precision is a real issue. It's extremely powerful, though. Once you get the good "snap" feeling, you double or triple your actual throwing power.
I add some kind of feathers behind the darts, just like on arrows, so that the shaft will travel straighter. That helps. Some weight at the tip (spear point of some sort) will also help the dart not to go straight up or turn around when you throw it.
Cheers,
David