I just knit because I like it
A little over a year ago (Feb 1, 2008) my 4th child was born and a friend of ours gave her a baby blanket. I loved it. Then she told me she knit it herself and I was floored! I decided right then that I wanted to learn. She showed me the basics. Cast on, knit, cast off. We don't get to see each other often so when I wanted to learn more I found this site and have been slowly teaching myself as I go since.
I love the feeling of finishing a project and knowing that I made it and that there's not another one exactly like it anywhere. I also find it relaxing...most of the time! I don't get to knit as often as I like though because I usually have to wait for the kids to go to bed.
So I guess the short answer would be...fun and relaxation.