ActiveEarth

ActiveEarth is a world time clock and global weather tool with up-to-date time zone information for every country, and current conditions and forecasts for the entire US and more than 40,000 international locations.

The main ActiveEarth window consists of a day/night shaded image of the earth and a control tray with clocks and tons of useful information. You can add cities to the map and corresponding clocks appear below.