That's the Infinity Scarf, here's a link -
http://www.thelimited.com/detail/sha...-scarf/1198140 You can do about 200-250 sts, depends on your gauge.
Also google for 'infinity scarf' +pattern - you should be able to find something. Here's one -
http://margauxelena.typepad.com/tent...th-avenue.html