http://www.understandingusa.com/chaptercc=3&cs=42.html - fantastic representation of population across US

• http://flowingdata.com/

• http://postspectacular.com/
• http://toxi.co.uk

• http://processing.org/discourse/yabb2/YaBB.pl?board=Syntax%3Baction=display%3Bnum=1204795304

For heat maps, at least consider Matlab

• http://blogs.mathworks.com/pick/2007/08/28/heat-maps-in-matlab/

• http://code.google.com/p/birdeye/
• http://degrafa.org/
• openflashchart2
• http://prefuse.org/

• http://gephi.org/

• http://archive.dojotoolkit.org/nightly/dojotoolkit/dojox/charting/tests/ - these are fantastic

• http://www.visifire.com/

• http://michaelvandaniker.com/blog/
• http://michaelvandaniker.com/blog/2008/07/06/how-to-make-heat-maps-in-flex/
• http://flowingdata.com/2009/11/12/how-to-make-a-us-county-thematic-map-using-free-tools

• http://thejit.org/

• http://www.simile-widgets.org/timeline/
  • Dataformat info
• http://www.computus.org/journal/?cat=6
• http://zerokspot.com/weblog/2008/06/25/create-a-timeline-in-javascript-with-simile/

• http://www.fusioncharts.com/free/Gallery.asp
• http://www.jsgantt.com/
• http://www.linb.net/Samples/