Google Javascript Style Guide:

http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml 

JQuery Blog:

http://blog.jquery.com/

JSLint:

http://www.jslint.com/

Javascript Design Patterns:

http://addyosmani.com/resources/essentialjsdesignpatterns/book/ 

Javascript: The Good Parts

http://it-ebooks.info/read/274/ 

https://www.youtube.com/watch?v=hQVTIJBZook 

PEAR PHP Coding Standards

http://pear.php.net/manual/en/standards.php

The Open Web Application Security Project (Top 10 Web Application Security Risks)

https://www.owasp.org/

PHP and the 10 Top Security Risks

http://www.sklar.com/page/article/owasp-top-ten

HTML 5 Boilerplate

http://html5boilerplate.com/

Twitter Bootstrap

http://twitter.github.com/bootstrap/

Skeleton

http://www.getskeleton.com/

BBC CSS Standards

http://www.bbc.co.uk/guidelines/futuremedia/technical/css.shtml

A List Apart

http://www.alistapart.com/

Smashing Magazine

http://www.smashingmagazine.com/

WebPlatform

http://webplatform.org