Visualization at the University of Maryland
http://www.cs.umd.edu/hcil/research/visualization.html

Gallery of Data Visualization by Michael Friendly of York University, Canada
http://hotspur.psych.yorku.ca/SCS/Gallery/

Information Visualization at Xerox PARC
http://www.parc.xerox.com/istl/projects/uir/projects/InformationVisualization.html

Information Visualization Laboratory at the University of Electro-Communications, Japan
http://www.vogue.is.uec.ac.jp/index.html

Information about slide rules
http://www.hpmuseum.org/sliderul.htm

Jock D. Mackinlay’s Home Page
http://www.parc.xerox.com/istl/members/mackinlay/

Edward R. Tufte's Home Page at Yale (I guess he doesn't particularly like the web).
http://www.cs.yale.edu/HTML/YALE/CS/faculty/tufte.html

If you want to get the book from Amazon.com…
http://www.amazon.com/exec/obidos/ts/book-glance/1558605339/002-0397281-5902440