I ran into a good tip on Linda Franz's blog when I made a scalloped border. She's the Inklingo lady and has a good tutorial on scalloped borders. To avoid having a seam in the valley of the scallop, which makes it difficult to turn, don't sew the binding strips together before you start sewing them to the quilt. As you get near a valley and it looks like your seam will hit it, cut a little off that strip and add your next strip. It slows you down when adding the binding, but it's worth the little extra time.