Most of the palaces and gardens are under the administration of Stiftung Preussische Schloesser und Gaerten (Foundation for Prussian Palaces and Gardens) in Berlin and Brandenburg, which you can contact for shooting permits.
Wage Rates* according to Collective Agreement
freedom of panorama
New in Berlin - The "Welcome to Berlin" information package
Berlin's Environmental Zone from 2008
VIZ Berlins traffic map