1. Updated list of locations - Now it displays whether information on more locations worldwide.
2. Introducing the data-cache - This is one of the most noticeable one. What this does is simple actually, unlike with the previous versions, now your whether information will be cached in your HDD thus giving you the ability to access those information even when you're offline. You'll also be able to share (sync) these data between multiple computers with ease as well.
To install indicator whether applet on your Ubuntu 10.04, 10.10 or even on the 11.04 Alpha using PPA use the following command...
sudo add-apt-repository ppa:weather-indicator-team/ppa
sudo apt-get update && sudo apt-get install indicator-weather