(which also gives a thorough explanation of certain chart types here)
Information is Beautiful: http://www.informationisbeautiful.net
Visual Complexity: http://www.visualcomplexity.com/
Always with Honor: http://www.alwayswithhonor.com/ (well-known for their icon design too)
A database of NYTimes infographics: http://www.smallmeans.com/new-york-times-infographics/
And a video on how the NYTimes creates its infographics: http://infosthetics.com/archives/2010/08/how_the_new_york_times_creates_its_infographics.html
Smashing Magazine has a very comprehensive overview of infographic resources on the web:
If you have a chance, flip through Data Flow volumes 1 and 2 if they're not checked out from the library or any of the books by Edward Tufte.