You can use this report to monitor what is going on in you search solution at the moment, looking as many days back as desired, and can be used for statistics or for rendering Tag Clouds etc.

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Capability

Popular Search Words

What are they looking for at the moment? Check the Popular Search Words report!

If so configured, each index will keep a customizable, rolling window log of the searched for terms, providing basic logging data for the "Popular Search Words" report found in the Administration Client. The terms are harvest from each search executed unless the search query is marked for exclusion (any possible non-user-generated search should usually not generate Popular Search Words log entries). 

You can use this report to monitor what is going on in you search solution at the moment, looking as many days back as desired, and can be used for statistics or for rendering Tag Clouds etc.