Gmail Lab yesterday announced a new feature about itself that it has added a new experimental level feature. The new feature lets you know where you penned that mail. In additional users can add their signature with the city and country ip
New Gmail feature lets the recipients of your e-mails know where you were when you wrote to them.

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2 votes - Gmail adds location-aware sign... - theregister.co.uk (chetanw)
2 votes - Add Your Location Automaticall... - devilsworkshop.org (pushpinderbagga)