Well, in Austria we have a famous Word:
Donaudampfschiffahrtsgesellschaftskapitän (Capitan of the Company which makes Cruises on the Danube)
And the longest Word in german should be:
Rindfleischetikettierungsüberwachungsaufgabenübertragungsgesetz (Sorry, i can't even expalin this Word)
Both Words are for real ;-)
End of OT