Unfortunately, InformationIsBeautiful.net basically exists to be an advertisement for the author's book, The Visual Miscellaneum. Which is a very pretty book--I own it--but not really full of informative infographics. There's some original content in the blog, but far too much of it is reposts of graphics from the book.

For a better (or at least more varied) selection of infographics I like:

* Chart Porn (http://chartporn.org/)

* Flowing Data (http://flowingdata.com/) which also covers datavis software

* Information Aesthetics (http://infosthetics.com/)

* We Love DataVis (http://datavis.tumblr.com/)

(edit: formatting)