10 - The Way Back Machine
The Way Back Machine lets you look at snapshots of websites from years ago. Craigslist hasn't changed much.
8 - Quantcast
Quantcast gives you stats on traffic, demographics, and other sites their customers go to.
7 - SpyFu
SpyFu shows you keywords, paid keywords, money spent on online advertising and their top competitors.
5 - Spyder Mate
Spyder Mate crawls sites and reports on broken links, domain age, average page depth and external backlinks.
4 - Market Leap
This site allows you to check a site's link popularity, search engine saturation and verify keywords
3 - Website Grader
Website Grader gives a website a grade based on SEO, the Blogosphere, social media and conversions.
2 - StatBrain
StatBrain estimates the number of visits a day for websites based on Alexa traffic rank and the number of incoming links.
1 - IndexRank
IndexRank is a 0-10 metric (higher is better) that uses an algorithm based on Google's indexing data to determine the indexing rate of a website.
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