The Markup Validator is a free service by W3C that helps check the validity of Web documents. Most Web documents are written using markup languages, such as HTML or XHTML. These languages are defined by technical specifications, which usually include a machine-readable formal grammar (and vocabulary). The act of checking a document against these constraints is called validation, and this is what the Markup Validator does. This validator can process documents written in most markup languages. Supported document types include the HTML (through HTML 4.01) and XHTML (1.0 and 1.1) family, MathML, SMIL and SVG (1.0 and 1.1, including the mobile profiles). The Markup Validator can also validate Web documents written with an SGML or XML DTD, provided they use a proper document type declaration.
http://validator.w3.org/
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Listing added: Dec 18, 2007)
News, photo & video sharing. Use YourMixx to tailor the content categories, tags, specific users and private groups—even RSS feeds—and we'll deliver the top-rated content as chosen by you and people who share your passions. So go ahead and whip up your own version of the web. Just tell us how you like it Mixxed and we'll deliver the best the web has to offer—morning, noon and night. Invite friends and family to a private group.
http://www.mixx.com/
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Listing added: Dec 6, 2007)
Vbulletin is one of the most widely used forum platforms around. Its default blue skin is pretty nasty, so most designers want to tinker as soon as the gear is installed, whether it's for their own site, or their clients. Here's a soups to nuts tutorial on how to skin Vbulletin (works with 3.5). Not for the faint of heart, or those expecting a 5 minute quick-fix. This is an exhaustive guide that gives all the details.
http://opserty.com/tut/vb/
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Listing added: Dec 8, 2007)