Google analytics
You can add Google analytics tracking to a gadget. More information on the http://code.google.com/apis/gadgets/docs/legacy/tools.html#Analytics_Gadgets Google documentation.
<?xml version="1.0" encoding="UTF-8"?> <Module> <ModulePrefs title="Google analytics" summary="" description="" author="" author_email="" thumbnail="" screenshot="" height="380"> <Require feature="opensocial-0.7"/> <Require feature="analytics"/> <Content type="html"> <![CDATA[ <script type="text/javascript"> // tracking this gadget as an pageview _IG_Analytics("UA-XXXXXX-X", "/example_gadget"); // Track this click as an pageview <input onclick="_IG_Analytics('UA-XXXXXX-X', '/example_gadget/click')" type=button value="This click is counted by Analytics"/> </script> ]]> </Content> </Module>