I was wondering what the difference is between Searches, Visits, and Page Views overall or just as it applies to the Natural Search Report (Traffic Sources -> Search Engines - Natural). Also, why are there zero's in the Searches column of the Natural Search Report?
Page Views: The number of pages viewed on the site.
Now in reference to the Search Engines - Natural report:
Searches: Shows the number of instances when a search was performed and the user clicked to land on your site and the link on the search engine was not a paid one.
Visits: Shows how much each search engine with a natural search click contributed to the visits number. One visits can have multiple searches done. One visit can also be contributing to a Natural and a Paid search
Page Views: The number of pages viewed on the site after landing through a natural search.
How many values are you seeing a zero against in the Search Engine - Natural report with the metric Searches? You should ideally see one if you are applying other metrics within the report.