It's easy to see how many people have viewed all of your shared documents and items. The total number of viewers for the current month is always displayed in the top left corner of your dashboard:

If you click on the 'more' blue link, you get this following report of all your viewers by month:

If you click on the 'click here' blue link you can view recent visitors by document title and visitor name (note that an 'anonymous' visitor is one who is not logged in to KeepandShare):

You can also view the history of any particular document or file by first clicking on its name so you are viewing it, and then click its green 'history' button. It will display a detailed report of the history of that document including all viewers.