This is not my video, but a great tutorial for the popular Crocodile Stitch

Crocodile Stitch - How To Crochet 

Uploaded by mikeyssmail on Feb 23, 2012

Learn how to crochet the Crocodile Stitch. This is a huge trend at the moment and the Crocodile Stitch is all the rage. Learn how simple this technique is. This stitch looks amazing in slow transitioning colour yarn as each scale looks slightly different.