If you wanna read about toothpaste and other stuff, here is a nice resource:

Remove Scratches from CD or DVD compact disc?, Part 2
http://www.infopackets.com/channels/...isc_part_2.htm

Brasso metal polisher, furniture polish and some other useful advices:

Remove Scratches from CD or DVD compact disc?, Part 3
http://www.infopackets.com/channels/...isc_part_3.htm