A good odometer type hit counter is http://www.tinycounter.com/create.php
There are different forms but of map counter and some that I like are Revolver maps and WhoAmungUs.
To get the web-counter go to the above website.
Follow the instructions and enter the html into an html gadget on your sidebar.
You may also like http://whos.amung.us/maps/customize/. Their maps are live maps so little stars light up as people visit from different locations. Kids love it when they see lights in other countries.