I'm a knitter, and it's great! It's something you can do while talking to other people, so if you are a bit fidgety (like me) it's a great way to keep your hands busy. You can also knit while watching movies and such. (makes me feel less like a bum and a bit more productive
) (As for the superficial difference between knitting and crocheting, knitting uses two straight needles, and crocheting uses one needle with a little hook on the end.)
I have recently begun quilting, too, and am really enjoying that. A quilt, however, takes up a lot more space than a scarf!
***edit*** I just had another thought. If you have an extra table, even a card table, you could put puzzles together. I find it very theraputic.