Blogs I follow, listed in its main category in alphabetical order. Specific topics In parentheses.

bookmarks_dev.md

Web development

• Addy Osmani http://addyosmani.com/blog/
• A list apart http://www.alistapart.com/
• Catswhocode http://www.catswhocode.com/blog/
• David Walsh http://davidwalsh.name/
• Nettuts+ http://net.tutsplus.com/
• Smashingmagazine http://www.smashingmagazine.com/

Php

• Phpmaster http://phpmaster.com/

Javascript

• Jspro http://jspro.com/

Ruby

• RubySource http://rubysource.com/

Web design

• Impressive Webs http://www.impressivewebs.com/
• Six revisions http://sixrevisions.com/
• Speckyboy http://speckyboy.com/
• Webdesigner depot http://www.webdesignerdepot.com/
• Webdesign tuts+ http://webdesign.tutsplus.com/

Wordpress

• Yoast (SEO) http://yoast.com/
• Wpbegginer http://www.wpbeginner.com/blog/
• Wptuts+ http://wp.tutsplus.com/

SEO

• Seomoz blog http://www.seomoz.org/blog