I often change the location between several cities.
Now I have to go through the options button, or right click the tray icon, move to active city tab and change the location there.
It would be easier if the active city would be a combo-box or would have a pulldown option to select the active city directly on the current, hourly or daily windows.
See the following example:
http://www.postimage.org/gx2fKtwi.jpg
You can also access the Weather Watcher system tray menu by right-clicking on mostly any part of the main Weather Watcher window.