sometimes i'll just saw a little slot in the dohickie. then take a flathead srewdriver and insert it into the slot. then take a hammer and hit the srewdriver forcing the drain to turn counter clockwise.
be careful not to hit it too hard, because you don't want to damage the tub.
also, if the crossmember isn't totally damaged, you can go to the department store and purchase a tub drain remover. (use this tool to insall the new drain as well)