Data visualisation and HTML playground

For those who are working on Web development and data visualisation, below links are very useful.
Some are for providing the much needed data visualization techniques, while others provide CSS and javascript integration

http://code.google.com/apis/ajax/playground/

http://jsfiddle.net/wkCNm/

http://www.fusioncharts.com/demos/gallery/

http://www.w3schools.com/css/default.asp

http://960.gs

http://freemarker.sourceforge.net/docs/index.html

http://www.w3schools.com/xpath/default.asp

http://formalize.me/

http://www.1stwebdesigner.com/css/powerful-css-tools-generators-automate-workflow/ #To test various CSS features

http://www.tutorialsbucket.com/draw-basic-shapes-css3-tips-and-tricks

http://thejit.org/static/v20/Jit/Examples/Spacetree/example1.code.html #alernative graphs

http://www.visualcomplexity.com/vc/ # visualisation samples