Herringbone stitch tutorial. This is one of the *best* knitting tutorials I've ever seen; notable mainly b/c it's presented by a man. It was weird at first to see a man's stubby fingers knitting this pattern, but his explanation was great. :-)
Herringbone Cowl in Malabrigo Rasta based on Herringbone Neckwarmer by Breean Elyse Miller free pattern on Ravelry at http://www.ravelry.com/patterns/library/herringbone-neckwarmer. Anything out of Rasta comes out nice.