Google just added a new feature that shows stats for services like Gmail, Search, Google Latitude and more.
It's like a personal Google Analytics, but it's less detailed and it focuses on security features. For example, Google shows a list of locations and browsers detected when you've signed in. If you never use Opera, but the browser is included in Google's list, then it's likely that someone else found your password. The activity page also includes the number of emails you've sent and received, the number of Google searches and stats from other Google services like Picasa Web and YouTube.
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Go to the Account Activity page and opt in for a monthly report.
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It's like a personal Google Analytics, but it's less detailed and it focuses on security features. For example, Google shows a list of locations and browsers detected when you've signed in. If you never use Opera, but the browser is included in Google's list, then it's likely that someone else found your password. The activity page also includes the number of emails you've sent and received, the number of Google searches and stats from other Google services like Picasa Web and YouTube.

Go to the Account Activity page and opt in for a monthly report.
source