Another list I developed for work that I thought I would share.
Email Newsletters
ClickZ: Offers a series of valuable email newsletters covering a wide range of online / search related topics. Some of the more valuable ones I subscribe to are: SearchDay, Actionable Analytics, Search Engine Watch Experts and Search Engine Marketing.
MediaPost: Contains numerous valuable newsletters, including: Online Media Daily, Search Insider and Notes from the Digital Frontier.
Search Engine Land: Newsletters include 100% Organic, SearchCap and Search Month Recap, all of which feature articles from industry leader Danny Sullivan.
eMarketer Daily Newsletter: Covers e-business and internet marketing trends.
Blogs
SEOmoz blog: Daily news, tips and highlights from the Search Marketing Industry.
reelSEO – Video SEO tactics, tips & information
Matt Cutts Blog – Matt Cutts is a Google Engineer who blogs about everything going on in Google’s world.
John Battelle’s Search Blog – John Battelle’s, author of the must read book “The Search, How Google and Its Rivals Rewrote the Rules of Business…”, take on search, media, etc.
TechCrunch – Dedicated to the online industry, with a focus on the latest news, trends and companies.
GigaOm – Technology news, analysis and opinions.
Mashable – Focus on Social Networking / Social Media news.
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I like Seotoolland.com also cause they list tons of free seo tools