Recently, Google has released a fresh keyword tool called the Keyword Planner.
If anyone wants that tool then click on Tool and Analysis tab option when you are signed into your Google Adwords account. The tool merges the advantages of the Keyword Tool and the Traffic Estimator into an incorporate workflow. The tool generally gives you a option to find fresh keyword and ad group ideas, get performance guesses for them to search the bids and budgets, and then add them to your campaigns.
Here are few screen shots:
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details on how to use this tool, see the help documents.