Have you ever wanted to know the name of firstname.lastname@example.org? Now you can. Through a bug in Google calendars the names of all registered Gmail accounts are now readily available. All you need to find out the names of any gmail address is a Google calendar account yourself. Depending on your view this ranges from a harmless "feature" to a rather serious privacy violation. According to some reports, spammers are already exploiting this "feature"/bug to send personalized spam messages.