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PHP

http://php.net

The php resource site

http://www.daholygoat.com

The one page php tutorial, very simple very basic, very good

http://magpierss.sourceforge.net/

PHP rss feed parser

CSS

http://www.subcide.com/tutorials/csslayout/index.aspx

CSS Lay-out tutorial

http://www.code-sucks.com/

Source for css lay-outs and code snnippets

http://www.dezwozhere.com/links.html

source for css help

http://www.alvit.de/handbook/index.php

Source For all webdevelopers

http://www.cssplay.co.uk

Play with css

Link

All you should know about floats

HTML

http://www.stopdesign.com/

webdeveloper blog & resource site

http://www.alistapart.com/

log for webdevelopers

http://dean.edwards.name/

some handy scripts

http://www.evolt.org/

Browser archive

http://www.fckeditor.net/demo/

puts word functions in your posts

Interesting Lay-outs/Sites

http://www.thehappycorp.com/words/

interesting column lay-out

FireFox info & ext.

http://www.mozilla.com/firefox/

For web development with the extensions:
https://addons.mozilla.org/extensions/moreinfo.php?id=201&application=firefox
Downlod manager in firefox to download all the links on one page

AJAX

http://www.protopage.com/protopage/about

Ajax all the way

Open Source CMS/BLOG

http://textpattern.com/

blog software

http://www.opensourcecms.com/

try open source software

http://www.pivotlog.net/

blog software

http://wordpress.org http://www.fresheezy.com/

Wordpress themes
Very popular blog tool

http://nl.wordpress.net/extensies/plugins/index.html

plugin directory's for wordpress

http://drupal.org/

cms/blog software

http://joomla.org/

Open source CMS (mambo)

5newwin%

WIKI

http://www.wikimatrix.org/

compare wiki's

Open source Forums

http://www.phpbb.com/
http://www.simplemachines.org/
http://en.wikipedia.org/wiki/Comparison_of_Internet_forum_software http://www.minibb.net/
http://www.mercuryboard.com/
http://www.mybboard.com/