Just recently I knit a baby blanket in Cascade Superwash. It is superwash wool, but it is soft (and gets softer with washing). The colors are amazing and come in large, lush balls.
The label says to machine wash and dry; however, I couldn't bring myself to put it in the dryer and let it air-dry instead. I used a mesh laundry bag in the washing machine and put it on the gentle cycle with no problems at all.