It's the default Splash Screen from KDE4.1 with some mdifications. It's designed to match this KDM theme
My intention was, to have a splash screen witch background is so easily modifiable that it can be symlinked to KDMs background.
The background is by Vlad Gerasimov, its one of KDE 4.1 default backgrounds, very blue, and very nice.
Based on the Default KSplash by Riccardo Iaconelli