We found this excellent collection of infographics at: The Best Article Every Day, which inspired us to collect a few other resources.
One of our favorite analog references is Envisioning Information, by Edward R. Tufte. First published in 1990, this jewel is the perfect mix of eye- and brain-candy.
Envisioning Information is one of those books you dig out when you’re suffering from brain-lock.
Here are some digital resources you may want to check out as well:
Other articles of interest:
http://www.nixlog.com/infographics/ – a very dense, but interesting weblog