stretchy cast on for ribbed edge

After watching Garnstudio's video, I thought to myself that there must be a way to work the cast on while holding the yarn in the left hand.  Here are written directions for doing so.  The cast on is very stretchy and works for both 1x1 and 2x2 ribbing.

Make slip knot on LHN. (The slip knot is not counted as a cast on stitch and will be slipped off needle later.) 
* With yib, place RHN under LHN. Wrap yarn under (from left to right) and over LHN and then under (from right to left) and over RHN.  (Loops made on both needles.)  Pull loop on RHN through. Yarn forward (under LHN). With yif, slip st from RHN to LHN purlwise. Two sts cast on.  Yarn back (under LHN). Repeat from * until desired number of sts are cast on.