Javascript

Best Practices
http://www.javascripttoolbox.com/bestpractices/

http://net.tutsplus.com/tutorials/javascript-ajax/the-10-javascript-mistakes-youre-making/

http://drupal.technicat.com/writing/programming.html

- what makes a good programmer?

Global Variables
http://stackoverflow.com/questions/1841916/how-to-avoid-global-variables-in-javascript

http://c2.com/cgi/wiki?GlobalVariablesAreBad

Performance & Testing
http://jsperf.com/

http://www.jshint.com/