I just received the A2 print of the Web Trend Map 2007 by Information Architects Japan. It visualizes the Internet in the form of a subway map and is very well done. You can also view the interactive version on their Web site, which displays a snapshot of that Web site upon rolling over the nodes on the network.
The first map was conceived in 2006 as a fun Christmas card for our Japanese clients and friend. To our surprise it gained worldwide attention, which encouraged us to release a more meaningful version. It now shows over 250 websites on 16 lines, and people have reportedly spent hours analyzing it. We greatly look forward to hearing your interpretations.
For more information, read their blog post.