Don't Let Google Dupe You – You NEED a 3rd Party Rank Checker! Post by Chris Hooley, of MCP Media, on the importance of using an independent rank checker.
Will Using AuthorityLabs Penalize Your Domain? Can rank monitoring penalize your position within search results?
Click Rate for Organic Rank Positions Click rate for different natural search rankings from AOLs search data around 2006 and why the SEO industry is growing quicker than other marketing outlets.
Search is Social Search is social because the web has been social from it's inception. The more active you are around the web the more traffic you'll get and the better your rankings will be.