This is one of the best keyword research tool. Pay Per Click advertising gives you an immediate source of traffic. Since it costs money, people take care to ensure they have the best keywords and are only paying for the ones that drive in the customer with a credit card in hand.

SpyFu lets you see which keywords your competitors are buying and which ones they optimize their site for. Once you understand the competition, you can beat them at their own game or your can exploit their weaknesses.

This website gives you all of their research. You have two options when using Spyfu to do the research of your competitors:

1. Type in a keyword phrase : this gives you the average cost for the term, daily budget, similar terms, adwords results, organic results, directory categories, and more. By checking the similar items, you can get other terms that companies are paying for along with your main term.

2. Type in URL : By typing in the URL of one of your competitors, you can find the exact keywords they are using in their pay per click campaign. It literally hands you their months of keyword research for FREE!

By combining Spyfu with other keyword research tools, you will know exactly what to optimize your site for. The information you get at Spyfu will blow away all other tools, though. All you have to do is find someone in your industry that has been around for a few years. You can be sure that they have adjusted and tweaked their campaigns to the fullest over time.

Now you get to take their research and save yourself years of time!