SpyFu

Want to learn where and how your competitors are getting traffic? SpyFu will tell you. This cool program will instantly tell you every single keyword your competitor’s website ranks for, every keywords they are bidding on in Adwords AND every single ad variation they have bid on in the last 6 years. If you are jumping into pay-per-click this information could save you thousands in testing because you can use their data to hone in on the profitable ads and keywords right away.