You can gently tap the cups and races from the headtube and fork by using a flat tipped punch and a hammer. The keyword is "gently". You need to set the punch against the lip of the cup or race and tap fairly lightly. Move the tap around the item so you move it evenly on each side. For an aluminum headtube, be careful that you do not gouge the inside of the tube with the steel punch.

There are also plans for building your own headset cup removal tool by using a piece of PVC pipe and cutting slots in one end. I have no experience with this, though.