Few more places of interest:
http://www.mattcutts.com/blog - Matt Cutts Google engineer's blog site
http://www.internet-home-based-busin...info/wordpress - Manish Pandey (that's me) Internet Marketing Blog site.
http://www.internet-marketing-blog.com - John Scott v7n.com owner's Internet Marketing Blog site.
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More SEO Tools
http://www.webconfs.com/similar-page-checker.php - Similar Page Checker
http://www.seochat.com/seo-tools/class-c-checker/ - Class C checker
Take care
Manish