I have recently bought a Furutech RD-1 Disc Demagnetizer which is supposed not to even out the CD's magnetic field as the Bedini does, but to demagnetize the CD. The manufacturer's theory is that the CD can hold small magnetic charges although it is made mostly from non-magnetic materials. They specifically talk about the ink used to print on the CD.
The Furutech has undeniable sonic effects. It removes digital harshness, increases dynamic range, it makes for an altogether creamier, more organic and more palpable presentation. However, it has no or little effect on tonal balance, its virtues become more noticeable in the long term. To me, listening fatigue is reduced considerably, and the feet-tapping factor is increased.
I don't know whether the undeniable effect of the Furutech has to do with magnetic fields or reduced static charges (is there a relation?), or (as some people at Audio Asylum have speculated) with thermal effects of the demagnetizing process, but it works. I have heard it, time and again.