I figure since I am always recommending triple verify all SEO advice I figured making a recommendation or two might help. The first place that I would start is Google Webmaster Cemtral http://googlewebmastercentral.blogspot.com/ SEOMOZ www.seomoz.org/blog SEOBook www.seobook.com Whatever you may think of Aaron, he does provide good advice and free tools. SEO Guide www.searchengineguide.com/ They provide good small business advice and have good writers. Bruce Clay www.bruceclay.com He missed it a bit this year with his silo approach, but his blog writer Lisa is world class good. Let me not forget to mention Google. Your question has already been asked and answered on authority sites many times over and the answer will be at the top of the search results. When you have found the same answer 3 times on authority sites you can feel secure implementing it safely.
I have tried some of the seobook's tools and I like it, until now I'm still using it. By the way thanks for the resourceful post