nice web designs

http://www.designshard.com/

how to evaluate a website

http://news.ycombinator.com/item?id=911710

Loader images

http://www.ajaxload.info/

Jquery Best Practices

http://www.smashingmagazine.com/2008/09/16/jquery-examples-and-best-practices/

SPAM Protection

http://plugins.jquery.com/project/SPAMProtection

Keyboard Events

http://docs.jquery.com/Events/keypress

Guide for advertisement

http://www.onlineradiostations.com/advertising.html

Simler

This is kinda cool:

http://simler.com

xhtml validation

It's a firefox plugin to validate if the page is xhtml valid:
http://users.skynet.be/mgueury/mozilla/