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SEOmoz Search Optimization Software
In Search Optimization some of the hardest challenges come from deciding which sources to trust. SEOmoz may not look like it at first glance but if you stay there long enough and read everything carefully you'll see why they are considered an industry authority.
SEObook Search Optimization Training
More "Wheat from the chaff" SEO Book has some awesome tools and training for those of you who really want to do it yourself. I have never seen anything on his site that I disagree with. But you have to know something about website development, and best practices to really understand how good it actually is.
Search Engine Land
Must Read News About Search Marketing & Search Engines. Tons of articles specific to the Search Optimization and Search Marketing. If you have the extra time reading the information here will give you a feel for the industry.
Matt Cutts Blog
When Google speaks it usually does it through Matt Cutts. Matt is the Google Rep to the Search Optimization Service industry.
Search Engine Watch
Search Engine Marketing, Search Engine Optimization and Paid Search. Search Engine Watch is another excellent market specific source of reliable information on industry trends. Always worth the read if you can spare the time.
Google Webmaster Tools
Google Webmaster Tools are a great place to start. The Search Engine Giant is not very forthcoming with all the information it uses to determine how to place your website in Search Results however it does give you a peek into the basics. Again, you are going to need to know a little bit about website coding and construction to take full advantage.