The Internet Marketing Blog by John Scott.
The V7 Network SEO Blog.
SearchEngineJournal by Loren Baker.
SearchEngineBlog by Peter Da Vanzo.
SEO By The Sea by Bill Slawski.
Danny Sullivan is also launching a new SEO site at SearchEngineLand on December 11th, 2006, and it's bound to be a great success.
Official Google Mouthpiece Matt Cutts also maintains a blog here.
SEO Blogs tend to be interesting reading with a higher signal to noise ratio. I highly recommend you read them daily.