I'm new here, I found this site today and I really like it!
Just thought I'd post a reply, because I'm also growing out my hair (again) and I also plan on never, ever cutting it short again (again).
I've made two of Knitty's 'Coifs' this winter, one for my mother and one for me, to keep our heads warm. They work really well, and are very fast to knit.
As soon as I've finished the armwarmer I'm working on now, I plan to knit another coif, this time in thinner yarn and making it not so wide (I'll just stop increasing sooner, it's a very easy pattern to fudge), to use as a headband. It's fun to make in very different yarns as well.
I wear mine differently from how it's show on the site though; I tie it at the back of my head, just above my neck, rather than under my chin. I think it looks better that way.
The pattern can be found here: http://www.knitty.com/ISSUEspring03/PATTcoif.html
Good luck with the growing-out!