Note: I wrote this over two years and never published it. I have dozens of draft posts like this just gathering dust because of my crippling perfectionism and self-doubt. I'm going through and posting the ones that are still relevant. Hopefully the links still work.
I'm a huge data visualization nerd and I've been compiling a list of my favorite data viz sites in a google doc for several years now. Thought I'd share it with the world:
Diagrams and Maps:
www.scimaps.org - science “maps”
http://chartsbin.com - statistics
http://cartastrophe.wordpress.com - bad maps
Various Data Visualization:
bimeanalytics.com/blog - analytics + infographics