Although I too love Dummies books I would be leery of buying a book on search engine optimization since
SEO changes so much so often and is more art than science.
Just be sure to include both some on-page optimization and some off-page optimization if you really want to get some bang for your buck.
I wish I had time to put together a list of resources & procedures that I use and have found effective however I'm under a tight tax deadline right now (October 15th-Deadline for all those April 15th extensions).
If anyone is interested I'll try to put together a resource post next week (or perhaps an
SEO guru can chime in?).
Leslie