Just input (or select) an IP address and see all past (and current) activity for this unique visitor (well, in most cases if it's a fixed IP).
A step further would be to add session information to be sure that information are really one visitor's (use IP, browser id, cookies, etc.)
It would be very usefull to have a keyword filter.
Frequently I want to check if a specific referer has drained users to my sites, but currently I have to check one after another, clicking on Next. Not really a quick way to do it...
Maybe not only for referers but also for keywords.
Google Analytics (GA) is a great tool. But we have no control on what they does with our statistics. That's why I think PhpMyVisites should implement most of GA features. The E-Commerce ones (like "Revenue Sources", "Visits to Transaction", "Product Performance", etc.) are great helps for small (and bigger) webshops.
From Google Analytics: "Have my visits and conversion rates increased or decreased? This report shows whether the total number of visits, the number of conversions for each goal, and the conversion rates for each goal have increased or decreased from a previous date range to the current date range."
Google Analytics don't have a good user-interface as PhpMyVisites have, so this feature would be sooo useful!