Molecular Switches based on Metal-Metal Electron Transfer are complexes which undergo reversible conversions between two distinct electronic states under external stimuli: temperature, light, pressure or electric field. The most investigated complexes are cyanide bridged Fe-Co complexes in which the change between the FeIILSCoIIILS  FeIIILSCoIIHS electronic states is associated to drastic modification in the magnetic, optical, dielectric and mechanic properties. Up to now, most of the research works on the systems have been focusing on fundamental aspects, aiming at better understanding their switchable properties to further improve them. However, we believe some explorative works are also needed to integrate these appealing multi-sensitive and multi-responsive complexes into materials to target potential technological applications. This presentation will recall general aspects on the FeCo switchable charge transfer systems1-2 and will show some of our attempts to integrate these switches into materials to harness their utility as molecular sensors or memories.3-5