The first time I heard about it is through a recycling company called Electronics Recycling Services CD Recycling Services DVD Electronics Video Tape
(I don't know what link policies are for this forum, but I am not selling anything nor do I work for them; I am just merely pointing a related fact out).
Companies like GreenDisk will probably sell the recycled materials to companies such as these to make it possible for them to make notebooks out of recycled CDs and DVDs. Since traditional residential recycling isn't able to accept these, greendisk will accept cell phones, CDs, DVDs, computers, printers and even jewel cases.
I'm sure there are others out there, but as a computer hobby-business helping my community I want to get in on this bandwagon although it costs a tidy sum.