I just recently started using the method PaperPrincess linked to. If you press the other way it looks like piping instead of flange due to the seam allowance filling up that area! Here is a close up of a recent quilt I did that way:
[ATTACH=CONFIG]549917[/ATTACH]
Here is what the back looks like, you can see the stitching on the back.
[ATTACH=CONFIG]549918[/ATTACH]