I just stumbled over Sebastian's blog entry:
The second Free and Open Source Conference "FrOSCon" takes place on August, 25th and 26th 2007 in Sankt Augustin, near Bonn, Germany. The conference is once again hosted by the faculty of computer science of the University of Applied Sciences Bonn-Rhein-Sieg in collaboration with the student body and the Linux/Unix User Group Sankt Augustin.
I attended FrOSCon last year and found it a very pleasant conference to be at. I gave two sessions about MySQL Backup and Security and the MySQL Business model, which both had a good audience and went quite well. I will definitely consider going there again this year, still pondering about the topics of my talks... The CfP ends on June, 4th, so make sure to turn in your suggestions in time!
If you are looking for a very well organized OSS event with lots of good technical content in a relaxed atmosphere, consider visting FrOSCon this year! I look forward to being there again.