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.
Mini Herringbone Stitch Pattern Wrong Side (WS): * P2tog and leave stitches on needle, purl the first stitch again and drop both stitches together from left-hand needle, repeat from * to last stitch, p1 Right Side (RS): *Slip 1 with yarn in back, k1, then with left-hand needle raise up the slipped stitch as if to bind off but before dropping off right-hand needle, knit it and then drop from needle, repeat from * to last stitch, k1