google account activity report

Google is launching a new feature today called Account Activity that will help users gain more insight into their usage of Google services.
Available to those who opt in, the utility will offer monthly reports detailing your account activity, like your number of sign-ins, how many emails you sent and received, the browsers you used, the number of Google searches you performed, the number of places you visited on Google Latitude, and a ton of other things that showcase the vast amount of data Google stores on you.

      The new service is more like an extension to Google’s dashboard, then, which already gives users an overview of all their Google accounts and services in use – it just puts more data behind them.
source:
http://googleblog.blogspot.in/2012/03/giving-you-more-insight-into-your.html