Matt Cutts is a head of spam prevention at Google. He has a blog that keeps me up to date with tools for search optimization (SEO and SEM) and whats up at Google. He also has some videos on you tube, that are great for understanding certain elements on search.
Google webmaster and official Google blog are great additions to the list.
Searchengineland is all about the internet business to hear what is going on around town as well as best accepted practices and constant updates to current search engine strategies for SEO and SEM.
Google has the official blog and the webmasters blog.
A fresh squeeze is a great blog about being Green in chicago. Only a few posts a month. Green Bean is about green buildings in Chicago.
Tree Hugger is a great blog about the environment. They usually have 20 posts a day.