I took mine out and use them as refrigerator magnets. They are awesomely strong. No more cheap magnets sliding down the refrigerator not holding weight.

Edit: Daughter really liked using the shiny platters in art projects (after degaussing with the RE magnets). I've reused some of the dc motors in other projects (arduino type stuff). All that's left is the small circuit board, read/write head and metal body to recycle.