Gmail is now even safer.

Every time you check your Gmail, look at "Last account activity" just below the Inbox. Click on "Details". Gmail will show you the IP address of the last people to check your Gmail. If it is not you, change your password immediately. Gmail will also tell you if someone from another country has been into your Gmail. If someone has hacked your email account from an IP address that is not yours, change your password immediately.

http://gmailblog.blogspot.com/2010/03/detecting-suspicious-account-activity.html

The most vulnerable point of using Gmail is your password. Make it long and difficult and do not share it with anyone!

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