Usually the only thing you get from a cyclone is a mess, but the Cyclone from Evolution helps metal shops clean up. The end is hollow, with a big magnetic plunger in it. Wave the magic wand over your mess, picking up the ferrous scrap, then hold it over the scrap barrel and pull the plunger. If only there was a version for sawdust.
Evolution sells the Cyclone for $13.
Cyclone Magnetic Cleaner [Evolution]