Last week, I gave a talk about consolidating customized product copies into a common product line. Using a model based approach, reverse engineering techniques, and taking individual product line requirements into account gives you a chance to improve the variabiliy comprehension to reach your target.
The slides are now available on the Karlsruher Entwicklertag website: http://entwicklertag.de/vortraege/von-produktkopien-zu-produktlinien
They recorded the talk on a video to publish it as well. I will add a link to this, as soon as they send a notification.
In summary: The conference was pretty interesting and they had a couple of pretty good talks. So +1 for the Karlsruhe Entwicklertag and I am looking forward for the 2013th edition