http://www.seobook.com/seo-spring-clean
Aaron Wall of SEOBook.com discusses a Spring Clean for SEO, even though it’s winter where he reviews 8 items that you should review as you do an SEO audit.

http://www.copyscape.com
One of Aaron’s 8 tips discusses Duplicate Content. I have made it regular practice to check for duplicate content on every site continuously by either searching an exact long phrase with Google directly or using the Copyscape service.

http://www.majesticseo.com/search.php
This tool was recommended by Aaron Wall in the previous blog post. It is an interesting tool to check for backlink patterns of anchor text, deep links, and unique ip addresses.  You initially only get basic information, but you receive a full report once you verify your site.

http://www.SEMRush.com
A new competitive research tool by the same guys that did SEO Digger.  It seems to compete directly against SpyFU and Compete.com.  I will check it out in more detail later this week as I don’t like the SpyFu.com interface and Compete.com is a little expensive for my tastes.

http://www.ViralConverstions.com
Micheal Gray – Graywolf has launched a new website that connects business owners with bloggers who want to do product reviews. The difference is that bloggers are not paid for links but might possibly get free products like a free book or other interesting offers. Interesting concept as it is definitely a way around ‘paid links’; will ‘bartered links’ be next on the horizon for the big G?

http://feeds.feedburner.com/~r/seomoz/~3/445594376/whiteboard-friday-whats-pagerank-got-to-do-with-it
SEOMoz Whiteboard Friday covers Page Rank and What It Has To Do With SEO.

http://www.seomoz.org/ugc/onetime-or-ongoing-seo-is-it-a-yes-or-no-question
An interesting SEO Strategy post by IgniteMedia about whether One Time or Ongoing SEO Is Best? User contribution from http://www.ignite-media.com/

http://wiep.net/talk/link-building/smx-london/
Powerpoint presentation from “Blow Your Mind Link Building Techniques at SMX London.

http://weblogs.hitwise.com/bill-tancer/2008/11/sizing_up_the_long_tail_of_sea.html
Dustin Woodard does a guest post at the Hitwise blog which shows that the Long Tail of Search could actually be 90+ % of natural search traffic–meaning the tail could be without much of a head or body.

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5. 5 Top Google Tools for SEO