SEObook used to be the Goto guide - but now I think it's a membership site that costs $100 a month.
GOOGLE just put out a free
SEO starter guide. Check it out.
Google Launches SEO Starter Guide
I don't know if any of these are any good or just trying to sell you stuff.
The Bruce Clay link is really good. Might be a little outdated.
free SEO training - Google Search
Hope this helps and best of luck!