sebas is a KDE developer working on the Plasma desktop shell
Jos van den Oever has written a program that loads OpenDocument Format presentations and shows them as rendered by KOffice and OpenOffice.As an added bonus, it also shows how these programs render PowerPoint files. PowerPoint files are converted to ODP first and then loaded into each of the two rendering engines.
This screencast shows innovative features in KDE Plasma 4. to manage windows and groups of windows in a user-friendly way.
This screenshots shows how the Plasma Workspace eases your interaction with removable devices and content from the web.
Componentized KMail using Akonadi demo in Plasma
Plasma intends to deeply integrate data from the (social) web into the desktop. The Open Collaboration Services API offers a way to interact with social networking sites such as kde-look.org and kde-apps.org. The screencast shows the first appearance of social desktop-related components in Plasma, KDE's desktop shell.
Qt Kinetic is the new animation framework that will become part of one of the future releases of Qt. Qt and Plasma developer Alexis Menard has created this small video showing off how Kinetic can improve the look and feel of the KDE desktop shell, taking the Picture Frame applet as an example.
KWin is KDE's window manager. For KDE 4.2 it has been polished and further enhanced with new effects.
Dolphin is KDE4's file manager. This video shows how it works. The KDE version used here is 4.2 beta1.
The Grid applet is new in KDE's playground. It's a container plasmoid.