OK Computer (Radiohead) Easter Egg - Catalogue Number No Data Reference

This is fairly simple. Get hold of a copy of OK Computer by Radiohead (I presume everybody has this album anyway) and look at the barcode on the back of the case. Then look at the catalogue number just underneath it (there are three boxes below the main barcode. It's in the second one)

The catalogue number is: CDNODATA 02

No Data is a questionnaire the band set up on their website at the time OK Computer was released. Baisically the catalogue number is a reference to this.

The No Data questionnaire can be found on Stanley Donwood's site:
http://www.slowlydownward.com/NODATA/data_enter2.html