Feel a compelling urge to let the world know where you are at all times? Google has you covered. The search giant just launched a mobile app, dubbed The company says Latitude is currently available in 27 countries on a number of devices, including Blackberries, Windows Mobile, and Nokia S60s. Android support will begin rolling out over the next week, and an iPhone app is coming soon. The service can also be used on PCs using an embedded iGoogle widget.