Hi Comiso,
>what are they advertising?
"Otto - Alles Gute 2008" ... Otto GmbH is (as I just learn from the Wikipedia) the world's largest mail-order company, and the "nose art" represents their catalogue. "Alles Gute 2008" is sort of a weakish pun ... it means "Happy new year 2008", but also "Everything that's good in 2008", alluding to their merchandise.
Note that the registration is "D-OTTO"

This means that the blimp is actually registered as a balloon and not as an airship, or it would have to be "D-LXXX".
When I first spotted the airship, it was actually coming towards me tail-on ... it wasn't very windy, so I guess the pilot was reversing for a landing. (There is a glider field behind the trees, and I guess he landed - or moored - there.)
Regards,
Henning (HoHun)