INFO VISUALIZATION: Here's a cool visualization I hadn't seen before. The History of Programming Languages by O'Reilly.
The presentation is interesting, however I wouldn't have put the greyed-out images of the animals behind the timeline. They tend to conflict with the greyed-out arrows that show a language's heredity. However, I do like to connection the images (not-so-subtly) imply between the ideas of evolution and programming language development.
The poster is available online in PDF format. You can also find full-size copies at Team O'Reilly Bookstores and upcoming O'Reilly conferences, such as the Open Source Convention in Portland this July. Finally, while supplies last, U.S. residents can get a copy of the "History of Programming Languages" poster when purchasing two books through oreilly.com. (View the full book list.) Use discount code OPC79 in the shopping cart. The poster will be shipped separately from your book order.