MarketLeap: You CAN Handle the Truth.

What does this tool do:  Gives you three tools to compare the search engine ranking of your site against competitive websites. 

Cost: Free

Who Needs It: Website builders and administrators. Those who want to do competitive research on ideas, products, services, and concepts prior to launching a website.

Info Page: http://www.marketleap.com/publinkpop/default.htm

Comments: 

Indispensible tool for measuring your existing website’s online visibility, popularity, keyword effectiveness. Do you have a viable product or service that you want to market through a website or weblog? Are your competitors already succeeding? Will you have enough customers? Come here to research the answers.