Mac Rumors Guide to Mac stuff

http://guides.macrumors.com/

Articles about CSS files

This is a good site for CSS info

http://www.contentwithstyle.co.uk/

Modular CSS
http://www.contentwithstyle.co.uk/Articles/12/modular-css

A CSS Framework
http://www.contentwithstyle.co.uk/Articles/17/a-css-framework


MaintainableCss
http://css-discuss.incutio.com/?page=MaintainableCss

This is a decent list of "where to go" items and "which programs can do what" on the web.
http://www.philb.com/iwantto.htm

A 37-page article giving an overview of AJAX. My only complaint is that they should have checked their grammar before publishing it on the web. Otherwise, it's an interesting article.
http://dhtmlnirvana.com/ajax/ajax_tutorial/

A FireFox extension that helps SEO assessment...
http://www.webmasterbrain.com/seo-tools/firefox-extensions/seo-links/

Article directories

Article directories are a great place for webmasters and publishers of ezines and newsletters to pick up free content. And for authors who write articles, they are a great place to distribute articles throughout the Internet, giving you more visibility and customers.

Here is a comprehensive list of the highest quality directories:

http://www.articlenexus.com
http://www.findbusinessarticles.com
http://www.allthewebsites.org
http://www.amazines.com
http://www.articlealley.com
http://www.articlebin.com
http://www.articlecentral.com
http://www.articlecity.com
http://www.article-directory.net
http://www.article-emporium.com
http://www.articlefinders.com
http://www.articlesfactory.com
http://www.articlesumbissions.com
http://www.articlewarehouse.com
http://www.authorconnection.com
http://www.buzzle.com
http://www.constant-content.com
http://www.easyarticles.com
http://www.ezinearticles.com
http://www.family-content.com
http://www.fresh-articles.com
http://www.goarticles.com
http://www.isnare.com
http://www.articledepot.co.uk

seo web site

This site has a search engine forum, and good seo resources

http://seochat.com/

http://forums.seochat.com/

seo forum

This site has a large number of search engine optimization experts.

http://cre8asiteforums.com/

Good eCommerce resources

This is a post that I came across in a search engine discussion web site. I don't remember the url for the discussion, but here's the content that's interesting. Good for e-commerce people who want to improve their business.

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Marketing: A highly informative resource, Marketing Sherpa (marketingsherpa.com) requires a paid subscription to read some of their articles and case studies. BUT every new article is FREE for seven days after it is published, so definitely subscribe to their email newsletter.

Advertising: Online advertising discussion list (o-a.com) is an email list that I have found to be very informative and helpful in this area.

SEO: One of the best (and dare I say only) reliable source is Search Engine Resources (searchenginewatch.com). You might consider becoming a member.

Web Designing: The bible of web designing for me - web style guide (webstyleguide.com).