A tool for determining the right keywords for your internet marketing business is:

the wordptracker tool – Gtrends

freekeywords.wordtracker.com/gtrends

This website will actually show you the same digits for the same keywords for your internet marketing business that you typed in freekywords.wordtracker.com.

The only difference is, with gtrends, you would see a multi-colored bar graph on the right hand side of the screen. This is what is called the google trends scope.

Then there is  Search-Based Keyword Tool by Google:

http://www.google.com/sktool/#

It provides keyword ideas based on actual Google search queries. it can be matched to the specific pages of your website.

Or

You can test your keywords More >