Probably the biggest change in KDE SC 4.6 is the redesign of the Activities system which makes it easy to associate applications to activities - once you create some new activities, right clicking an window title you'll have an option to make that application part of a certain activity as you can see in the screenshot below:

Install KDE SC 4.6 In Ubuntu 10.10 Maverick Meerkat
To install KDE SC 4.6 in Ubuntu 10.10, open a terminal and copy/paste the following commands:
sudo add-apt-repository ppa:kubuntu-ppa/backports
sudo apt-get update
sudo apt-get install kubuntu-desktop
Once installed, log out and select KDE Plasma Workspace from the login window.
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