I knit and crochet. There are actually threads further back in this sub-forum that talk about it, too.
I was already a vegan when I learned how to knit, so I have never knit with wool (or silk, cashmere, alpaca, mohair, merino, angora... there are so many different animal fibers out there). Unfortunately, the animal products do dominate the world of fiber arts. But non-animal fibers are starting to gain popularity.
I've tried two types of bamboo yarn so far. One was the South West Trading Company, which I found a little scratchy, but beautiful. The other kind, which I adore and is incredibly soft, is Sirdar's Just Bamboo.