Google Maps performance tips
http://www.youtube.com/watch?v=zI8at1EmJjA
MSFast - Browser performance tool for IE
http://code.google.com/p/msfast/
Project Fondue CSS Sprite Generator
http://spritegen.website-performance.org/
YSlow - Site Performance Testing
http://developer.yahoo.com/yslow/
Aeriform
http://www.aeriform.co.uk/
Javascript Form Validation with standalone, jQuery and Prototype plugins
http://www.benjaminkeen.com/software/rsv/
Ultimate PHP Form Validation
http://www.benjaminkeen.com/software/php_validation/
Open Laszlo - AJAX and Flash Platform
http://www.openlaszlo.org/
Using JavaScript and forms
http://www.javaworld.com/jw-06-1996/jw-06-javascript.html
Form Validation by Apple - Javascript
http://developer.apple.com/internet/webcontent/validation.html