I also love J Crew scarves. I own two wool ones that are a thin, knit, soft wool. I use them constantly because they are very wide (you can drape it over your shoulders, over your lap, all over your neck). I have used them for travel and they are perfect. Because they are thin and light they don't take up much space.
I also own a scarf from the crewcuts line-- it's short, but a cute (and cheap) way to act a little girly on a cold day. The particular one I bought has a knit bow at the end of the scarf.
I own two J.Crew wool scarves and love them! They are so warm and a great length. I wish I had actually purchased more of them. And the best part is they are comfortable as well.