One of the things I love most about Ubuntu is how easy it is to install software. Ubuntu’s PPA plays a great deal on this. So, here’s a small list of my preferred PPAs:
George Dumitrescu: indicator workspaces
MyUnity: well, for MyUnity
Peter Hurley: for Evolution Exchange Web Services (aka, evolution-ews).
Adding these PPAs to your system is as easy as running ‘sudo add-apt-repository ppa:<ppa-address>’