Common problems, fixes, and layouts! Try this thread first (Add your own too)

First stop - W3schools for reference. [CSS, HTML, XHTML, ASP, .NET, Javascript, DHTML, RDF, DOM]

Try HTML Dog for very simple tutorials for beginners on CSS and HTML. [CSS, HTML, tutorials]

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fberriman.com

Web design/development:
Getting started with AJAX, from the Mozilla Developer's Center - a nice introduction to AJAX.
The PHP manual - indispensible.
A List Apart - lots of great articles on design, accessibility, usability, etc. For example:
      In Search of the Holy Grail - a good guide to creating three column layouts.
      Getting Started with AJAX - what it sounds like.
CSS Zen Garden's resource guide - lots of links to CSS resources.

Programming
The comp.lang.c FAQs - my first stop whenever I have a C problem. If the FAQ list fails to answer your question, ask in the comp.lang.c newsgroup (dA won't let me put news:comp.lang.c in the href, so just imagine that was a link). They don't suffer fools lightly over there, though, so lurk a couple of weeks first to get a feel for how to ask your question.
Perl Monks - a Perl community, full of helpful and knowledgeable people.

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ma'at: The good thing about this is it has the appearance of a bullet-proof vest, so any fanatics would be put off altogether. Or they'd simply go for a head shot.

Oh, and check out `mp3chuck's PHP tips and resources.

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ma'at: The good thing about this is it has the appearance of a bullet-proof vest, so any fanatics would be put off altogether. Or they'd simply go for a head shot.

Validation
The W3C Markup Validation Service.
The W3C CSS Validation Service.
Other QA tools can be found in the W3C QA toolbox.
Total Validator, besides (X)HTML validation, also does some accessibility testing and can take screenshots in a number of browsers and e-mail them to you. Great service.

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ma'at: The good thing about this is it has the appearance of a bullet-proof vest, so any fanatics would be put off altogether. Or they'd simply go for a head shot.

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fberriman.com

Web Development Related (Resources and References)
ParticleTree - Web development articles and resources. [resource, ajax, css, javascript, xhtml]
Vitamin - Web development, design and entrepreneurialism resources. [resource, web, design, entrepreneur, ajax, css, ruby, javascript]
Veer - Stock photography, illustration, type and motion as well as supplies for the working artist. [resource, stock, supplies]
AJAX on Wikipedia - All the basics of Ajax. [resource, ajax, javascript, xmlhttprequest]
Lorem Ipsum Text - The common latin filler text you've probably seen everywhere. [resource, lorem ipsum, lipsum, filler, text, latin]

JSON - JavaScript Object Notation (goes fantastically with Ajax). [reference, ajax, json, javascript, object notation]
Ruby Class and Library Reference - Excellent reference for the goods on Ruby. [reference, ruby]

Education, How-To's, etc...
MIT OpenCourseWare - Ever wanted to see what classes are like at MIT? You can view a bunch of them online here (sometimes including video lectures!) [education, MIT, classes, courses, lectures]
Lifehacker - Productivity and software guide, generally useful little tidbits each day. [how-to, productivity, software, general]
Manybooks - Free eBooks in PDA format (Sherlock Holmes, Julius Caesar, A Tale of Two Cities, etc..) [books, pdf, pda, free, ebooks]

I think that should do it for now, I'm sure if I dig through my bookmarks some more I can find some more good links and whatnot

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Wow I almost forgot this one:
Mint Site Statistics - Simple and flexible site statistics based on PHP, MySQL and JavaScript. [product, statistics, traffic, analysis]

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Microsoft Stuff
MSDN - Microsoft Developer Network: Site with resources, documentation and a lot more things about different Microsoft applications and the .NET framework. [Microsoft, ASP, .NET, C#, Visual Basic]
MSDN2: Documentation for Visual Studio 2005 and SQL Server 2005. [.NET 2.0]
ASP.NET: Official Microsoft ASP.NET 2.0 site.
4 Guys From Rolla: Big library of articles on ASP.NET (both 1.x and 2.0) [ASP.NET]
Microsoft Patterns & Practices Home of the Enterprise Library (open source collection of application blocks to make development easier) and different recommendations for software development under a Microsoft plataform [patterns, .NET, Microsoft]

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"The language and concepts contained herein are guaranteed not to cause eternal torment in the place where the guy with the horns and pointed stick conducts his business" - Frank Zappa

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fberriman.com

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ma'at: The good thing about this is it has the appearance of a bullet-proof vest, so any fanatics would be put off altogether. Or they'd simply go for a head shot.