Yah, that would be nagiosconference.de. It's been linked on the Nagios Exchange main page for months now
I'll be heading over there by car, which is a seven hours drive (since I usually don't exceed speed limits and I take breaks along the way as well). My company'll be paying for the hotel+registration fee, so I'm lucky.
Now I'll just have to polish my german a bit, since it's been a while <3