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Google Insights is tool provided by Google for seeing popular searches and trends.

If offer powerful filters so that you can see results based on types of search (eg web, image etc), locality, topic and time frame.

One of the most useful tools is  that it allows you to see breakout search terms, thats search thats have suddenly gained a huge increase in popularity.

You can use Google Insights to see popular searches in your websites field, this could be an incredible tool for reaching more readers.