We get all sorts of variations to this question and I am sort of tired of repeating myself so it's Sticky time. To begin are links from myself and falkencreative. Feel free to post here or IM any other links you think should be added. This way we do not have to repeat the answers all the time.

KillerSites Network

• How-to-build-websites.com

• SecretSites.com

• CSSTutorial.net

• KillerPHP.com

• Idea22.com (Video Tutorials)

Combined technology training

• W3Schools

• Tizag.com

• NetTuts.com

• Flex 3 in a week - excellent 47 video training course for Adobe Flex.

• Safari Books online - is an online bookstore offering everything possible for electronic books on technical issues.

HTML

• W3Schools HTML

• SelfHTML (German)

CSS

• W3Schools CSS

• CSS-Tricks.com

PHP

• PHPVideoTutorials.com

• PHP.net

Real Classes ($$)

• ITT-Tech
       I was signed on to get an Associates Degree in Web Development with ITT, I was impressed by the course and it teaches real world design based on what employers today want and not "Ivory Tower - we think this is what you need" classes. Alas I had to decided between school and a paying job... so off to Alaska where there is no ITT no no degree.

• Webucator
       Not cheap, I have taken some of these online courses for my job and they are very good. They are worth considering.