Dan Vrátil and Alex Fiestas have been working on writing a brand new screen manager for KDE to overcome the current configuration shortcomings of the current settings panel. As Fiestas wrote today on his blog, "We are trying be as smart as possible adapting the behavior of it to each use case making the configuration of monitors as simple as plugging them to your computer."
They're still determining the defaults to their new screen manager and making other changes, but it's coming along very nicely. This work is being sponsored by Red Hat and Blue Systems.
Rather than a lengthy description, the developers posted a video (embedded below) to show off this new multi-monitor screen management experience that will eventually land in KDE.