Quick SEO Evaluation Tools
Website Grader-pretty quick way to find out about your site
SEO Automatic Tool-tells you about on page search engine optimization factors
Review My Web.com SEO Analysis Tool
SEO Backlink Checker Tools
Google Backlink Checker
Backlink Watch
Yahoo Backlink Checker
MSN Backlink Checker
Technorati for blog specific backlinks
Competitive Analysis Tools
Spy Fu
Google Insights for Search
SEO Moz Trifecta
SEO Moz Linkscape
Other Helpful Search Engine Optimization Tools
Google Webmaster Tools
Yahoo Webmaster Tools (same link as Yahoo backcheck links above)
Webmaster Live Tools
SEO Book Link Suggester (based on similar keyword or website topic)
Free SEO Keyword Tools
Google Keyword Tool
(related keyterms & web user data)
SEO Book Keyword Tool (web stats on your key terms)
Wordtracker Question Tool (web stats on questions around your keyterms)
Google Sets (semantically related terms to your keyterms)
Quinturra (semantically related terms)
SEO Tracking Analysis
Graph of Backlinks Over Time for search engine marketing purposes.
Compete-unique user statistics over the year
Quantcast-multiple analytics on users of your site
Go Rank-key word number & density
