Chemistry of palladium-containing polyoxometalates (POMs, discrete polynuclear oxo complexes of transition metals) has experienced an impressive development over the last ten years.[1] In particularly, a novel subclass of POMs built by square-planar PdII addenda ions has been discovered.[1-2] Here we report on a series of hybrid polyanions composed by both tungsten(VI) and palladium(II) addenda. These species possess various nuclearity and structures and make a logical link between “classical” area of PdII complexes of polyoxotungstates and novel subclass of POMs, polyoxopalladates.[4] Solution behavior and potential application of new compounds as precursors for electrical contacts in molecular electronic / spintronic devices will be also discussed.