SEOmoz’s CEO and Co-Founder, Rand Fishkin has put together a list of every website statistic publicly available that he considers valuable. The 56-point list includes:
If you just want a quick assessment of a site’s visibility, try Page Strength, a cool tool Fishkin created with Matt Inman.
Competitio.us provides a free information gathering service that helps you keep track of your competitors. Once you register, it is a simple matter of listing your competitors by URL, and voila – instant competitor information. Using Alexa, competitious gives you latest news and traffic information about your competitors, as well as posts from both company and non-company related blogs. Go on, give it a shot!