Screenlets is widget applications written in Python, by default comes with many widgets such as ” system monitory, RSS reader, sensors indicators, clocks, calender, … etc”, you can install additional screenlets.
Screenlets 0.1.4 comes with many improvements and many bug fixes specially for Ubuntu 11.04 Natty Narwhal with Unity Interface, otherwise the Screenlets 0.1.3 wasn’t working quite good in Ubuntu 11.04 Natty Narwhal Here.
Install Screenlets 0.1.4 In Ubuntu 11.04 Natty Narwhal | PPA
sudo apt-get update
sudo apt-get install screenlets
Install additional Screenlets Here.