I'm wondering what the best resources on Search Engine Optimization are? In terms of books, websites and even organizations that assess existing websites.
www.google.com/webmasters/tools/ - Google webtools have been incredibly helpful for us. Also http://www.vanessafoxnude.com/ (no..it is not an adult site!) is a good blog on SEO
Never knew you were here too. Btw, SEOBook training program+forum access costs 100$/pm, but is worth every penny. (We are a small bootstrapped firm, for which 100$ is not exactly peanuts, but what I learnt from this 100$ has had teremedus ROI)
Another great resource from SEOmoz that some might miss (b/c it's not exactly easy to find on their site) is their "Search Engine Ranking Factors" report (it's free).
The report tries to identify which SEO factors have consensus among a panel of 3-dozen or so SEO experts (as well as which factors are deemed dubious). It's a great way to get a large number of opinions on specific topics and try to focus in on a few high ROI factors (if you've got limited resources/time like I do).
NetConcepts case studies page: http://www.netconcepts.com/tag/case-studies.
I've found it to be the best site out there to learn what needs to be done without coming across as an infomercial, which a lot of SEO sites annoying do.