How can I view the history for a particular visitor?

When viewing your detailed click, actions or sales stats you can actually click on any IP address to see a detailed “visitor history” for that particular user.

It will show you all of their activity—clicks, actions, sales, etc.—in chronological order, and even show you a few other stats like their “lifetime customer value” or LTV.
 
 
Tip: If you want to know about the average lifetime customer value—and other related stats—just hover over the  icon in your link stats. The details are coverd in this FAQ:
 
   What are all the different columns in my stats?