These links on how to bind a quilt (including mitered corners) were just posted by MTS in another thread:
Here are Sharon Schambers video on binding (there are 3 parts):
http://www.youtube.com/watch?v=4PE0Yq9iGlc
http://www.youtube.com/watch?v=u3vHI7rgZpw
http://www.youtube.com/watch?v=W--xgi4nux8
They are great!