Domain Statistics and Comparison
This tool helps you get all kind of statistics of your competitor's domains.
The statistics include Alexa Taffic Rank, Age of the domains, Yahoo WebRank, Dmoz listings, count of backlinks and number of pages indexed in Search Engines like Google, Yahoo, Msn etc.
It will probably help you figure out why some of your competitors are ranking better than you.
Importance of Backlinks
This article will explain to you what a backlink is, why they are important, and what you can do to help gain them while avoiding getting into trouble with the Search Engines.