Gmail users can now track their recent sessions and you can also sign yourself out remotely. With this new feature, you can see more details about your recent activity on your account. Your email account can contain a lot of personal information, from bank alerts to love letters. We are in the process of rolling this feature out to the latest version of Gmail, which is available for Firefox and Internet Explorer 7. For others who don’t want to think about IP information, you don’t need to.”]
Source: https://gmail.googleblog.com/2008/07/remote-sign-out-and-info-to-help-you.html