KScreen has been the talked about new way for KDE users for controlling your displays with support for preserving display configurations, setting up screens in a presentation mode, or virtually any other configuration you could desire for the KDE desktop. KScreen uses the X.Org Resize and Rotate (RandR) extension for communicating with the display drivers.
KScreen 1.0 is the first stable release of the system settings module. More details on the new release can be found via this blog post. KScreen 1.1 is also now entering development.