A well-rounded view on search engines and search engine marketing by senior members of the major SEO/SEM forums on the Internet.
http://www.seroundtable.com/
Threadwatch.org cuts through the chatter and produces a clear signal for the time starved professional Internet Marketer.
http://www.threadwatch.org
Offers daily search engine news, reviews of tools, and an ebook for sale.
http://www.seobook.com/
Blog offering search engine news and SEO tips, commentary and analysis.
http://www.searchenginelowdown.com/
A look inside the world of search from the people of Yahoo!
http://www.ysearchblog.com/
Insight into the news, technology, and culture of Google.
http://www.google.com/googleblog/
JenSense - Making Sense of Contextual Advertising (AdSense, Yahoo Publisher Network, etc)
http://www.jensense.com/
Performancing is blog for professional blogers. Covers topics from security to design, with its main focus on monetizing your blog.
http://performancing.com/
Graywolfs blog covers search and media, and he enjoys a good rant :)
http://www.wolf-howl.com/
No nonsense commentary on search engine marketing from Greg Boser
http://www.webguerrilla.com/