lesson:
http://www.rileyblakedesigns.com/med...Lesson_pdf.pdf
here's a link to a photo tutorial:
http://www.rileyblakedesigns.com/cut...ding-tutorial/
and here's a video using the same technique on miters and that final seam for machine binding:
http://youtu.be/i9riC03FNRQ
I just watched all of these, and they are very good. I think it's a good idea to get lots of opinions. Then you can pick out your favorite.
I never understood why the strips are overlapped with some extra sticking out when the mitered seams are made. I just match mine up to the edge of the fabric. No trimming.
In the videos, they clipped and cut off a piece of binding to measure where to cut off the tail. In my method, the magic triangle does that. It's a built in measure. They put the triangle in afterwards anyway. You need it to see where to sew the seam.
Also showing how to fold the binding strip straight up and then bring it down explains what happens when I do the "Pinch" folding at the corners. Just be sure to pull it down snugly so there is no extra fabric hiding in that fold.