PraxisHandbuch BPMN is a must read for all people that understand German. We've worked quite a lot with Bernd Ruecker and the other folks at Camunda. And it's always a pleasure.
At Camunda, they have a lot of experience on how to bring BPM into practice. There is a lot more to it then just using a BPM product. This book provides simple guidelines so that any company can benefit from the real power of BPM.
The rest of the world can only hope that it gets translated soon :-)