Discovery
This was the purpose of the thermocrome material used on the Year Zero CD. After ripping his CD to mp3, an ETS member [1] that the CD had some binary numbers on it:
0110 010 1011 110 00011 101 00011 00101 0111001 00110110 1011 010 010 1101110011000 010 11 011 0 0 0 01 0 1 1 1 00 110 1 1100 1100 1 01 01 11 0 1 0 0
Which has lead to the URL.
However, at the time of discovery the website shows only a characteristic YZ website background and the following text:
Pilgrim Stream: 24.7 Data in transit -
Which probably means it will be active in the future.