This is the video that I used to learn how to make it. I have been converted to using only bias binding; I doubt that I will ever use straight of grain binding ever again. I just love how it hugs the quilt edges, straight and curved, and I NEVER get puckers and lumps like I do when I use straight of grain binding.
http://www.ehow.com/video_4433309_cut-bias-binding.html