Here's a quick, kinda cute video tutorial I found on using packaged double fold bias tape. Hope it helps.

http://www.youtube.com/watch?v=4fEv3VXPUEs

If nothing else...its kinda fun to watch, but she does have some good steps on this too.

That had really good tips, but again she didsn't show to miter the corners. I just prefer miter corners for binding rather that straight. I'm not sure what the term is for a straight corner unless that is it. The borders I like straight but not the binding. Depending on the quilt I have mitered the borders as well. I did this on my very first quit, it was a foldy pattern. I do know what started my issue with pre packaged was I had the wrong fold. Thanks for the clip.
You know there are some very talented and creative people in the world and the internet has given me the oportunity to watch/listen and learn from them.