PACmeter - Popularity, Authority, Credibility Online: How To Measure Them? - Robin Good' Sharewood Tidings
SpyFu
Website Traffic Estimates by TrafficEstimate.com
Enterprise SEO Software for Advanced Marketers | SERPS.com
Google Keyword Planner: How to Get Phrase & Broad Match Traffic Data | WordStream
How to Research Keywords: Tips, Competition and Squirrels | Orbit Media Studios
Choosing the Best Keywords for Your Website by Vertical Measures
Wikipedia Confirms Google Traffic Is Steadily Dropping