Hi dflee,
I use the Acoustic Revive RD-3 disc demagnetizer. I bought it about a year ago and I notice a subtle but obvious improvement in most of the discs that I demagnetize. I think it is an accessory worth having if you are completely satisfied with everything else about your CD player, but you wonder what else you could do to squeeze the last bit of goodness out of each disc.
Kind of expensive, but super easy to use.