Keyword Spy is a very nifty tool that helps you to find your keywords as well as discover a whole host of information about websites.
Now, there is a FREE Firefox plug-in which brings all of the information to your browser. It sits very neatly at the bottom of your Firefox window and allows you to conduct searches from within the browser.
One of the best bits of this tool is the facility to see exactly what your competitors are bidding on in their PPC campaigns when you search on Google.
If you haven’t tried this plug-in, we strongly recommend you do so – before your competitors!