Doing a little mid-winter research into slingshots has been fascinating. At short ranges of 10 yards or so and in the hands of a person who practices, the slingshot is amazingly accurate and effective against small game and birds.
The spectrum of slingshot types and materials is also amazing.
In this video, Dave Canterbury modifies a cheap factory slingshot to shoot arrows.
http://www.youtube.com/watch?v=-6LxKfpAPYAI have some metal arrows, some golf tees and an extra slingshot already. I'm going to try and fabricate an arrow rest for it.