“Who are the most popular or best SEO bloggers that are very respectable in the SEO world and offer lots of knowledge.”
Here are some SEO blogs I like to read every once in awhile:
SEO Black Hat – Quadzilla’s some really good posts and he also has a pay forum if you really want to get down and dirty.
SEO Book – Aaron Wall’s got tons of SEO stuff including training coarse and lots of free tools including the one I use which is a SEO plugin for Firefox.
SEOmoz – Rand Fishkin is probably one of the best in the business and his blog posts are usually very in depth and informative, great information for beginners to experts.
Wolf-Howl – Michael Gray, another blogger that’s been in the business for a long time.
Search Engine Land – Tons of news and articles on what’s going down in the search world.