I do double folded binding, cut straight on the grain. Painiacs, that is cutting the binding twice as wide as you need, and starting with it folded in half, lengthwise. I sew the raw edges together to the front side of the quilt, (miter folding the corners), then fold it around to the back side and pin it so I'll catch it when I stitch-in-the-ditch from the front side.
If I was more patient I'd probably hand sew it down on the back side...
I then go back and hand stitch the four corners neatly.