Or use them for something or other? Though coasters and bird scarers are the only bright ideas I've seen! (Do you have gardening neighbours who could use them?)
Personally I find them pretty (especially when held face to face), and don't have the heart to throw them away. (I live in Ireland, and get lots of ISP CDs that are useless to me anyway, being UK-only). I've been threading them on an old, flexible lampstand, and the stack (18" so far) is getting quite sculptural. (I must try lining a box with them and putting a light in it).
Washers? Flooring? Roof tiles? Someone should devise a use for this increasing waste!
I saw an interesting "work of art" table top a few weeks ago made up of chopped CDs/DVDs embedded in clear resin. It was the prototype of a sculpture or something that was being made for the Chelsea Flower Show but I never saw it there.