Here are Sharon Schamber's videos on doing binding.
Check out how a master quilter does it.
You don't have to incorporate every step she does, but at least it will give you some ideas.
I will say that my binding, which I thought was pretty good, improved tremendously once I started incorporating some of her methods.
Good luck.
Part 1:
http://www.youtube.com/watch?v=4PE0Yq9iGlc
Part 2:
http://www.youtube.com/watch?v=u3vHI7rgZpw
Part 3:
http://www.youtube.com/watch?v=W--xgi4nux8