I generate a LOT of sawdust from the planer and jointer going from rough lumber to S4S in the shop, and most of it gets put in large 55 gal drum plastic bags which go in the trash. In the winter though, my wifes aunt takes a few bags and instead of salt, throws large amounts of sawdust on her steps and sidewalk when there is ice and snow. Doesn't melt the ice as salt does, doesn't provide as much traction that cinders do, but it does make it less slippery and its free, easy to use and biodegrades as soon as it starts to get warm. The salt kills grass and vegetation and the cinders lots of people use don't go away either.
Myself, I use salt... that fact that the grass right alongside the walk dies is a plus for me, keeps me from having to trim it.