"The Desktop CD runs a live desktop directly from the CD and can install to your hard disk. The Alternate CD includes a text based installer for low memory, LVM or RAID installs.
The DVD contains both Live Desktop and Alternate installers, as well as the other packages in our main archive." -
http://www.kubuntu.org/download.php
Actually Fyron I don't think the live cd could install to the hard drive until the last release.