GraphJam is a fun site that consists of user-generated graphics that reflect song lyrics, movies and other elements of popular culture. Bar graphs, flow charts, Venn diagrams and the dreaded pie chart are all represented.
Anyone who has assigned, created or edited a graphic for a newspaper or magazine will likely get a laugh out of some of these. And you can make and submit your own.
Here's something similar to FunGraph that I like -- Jessica Hagy's Indexed blog:
http://indexed.blogspot.com/