Not a shocker here; SEOmoz has provided great daily posts for quite a while now.
Personally I'm an SEJ fan for a lot of reasons; one being that they're the only SEO blog that offers an app so I can read it on my iPhone easily. But the reason I added it is because of the variety of authors & perspectives.
I've always been a huge Blue Hat SEO fan, but I'm quite disappointed it's not frequently updated with new posts. But no one can argue how much of a fun read this blog is! Some of the most creative SEO tactics I've ever heard of.
An awesome part of SEO that only Bill Slawski addresses - search patents. A great read on what Google, Yahoo, and Bing are up to.
Another blog I wish was updated more often. Wiep has some great link building posts, as well as a few great lists of popular link building articles.
This link building blog doesn't get as much rep as it should. Ontolo has dished out some seriously awesome content, such as the all in one guide to guest posting.
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