Marketing & Google
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1   Link   Hub Finder
Hub Finder allows you to find sites which link to common resources, or resources that rank well in Yahoo! for a specific term.
2   Link   Online Publications
Find online newspapers and magazines
3   Link   Search term suggestion tool
Type a keyword and have KeywordDiscovery generate the top 100 keywords for you.
4   Link   Slang Lexicon
Increase your keywords with slang and misspelled keywords
5   Link   Website Grader
Website Grader is a free seo tool that measures the marketing effectiveness of a website.
6   Link   Google ranking factors
There are about 200 factors that Google takes into account when ranking a website.
7   Link   Seoquake
Browser plug-in for SEO
8   Link   Wayback machine
Track the development of a website on a particular domain over the years.