Thin films which have electrical bistable effects are mostly metal-organic complexes and/or organic-organic (all-organic) complexes. Very recently some simple (mono-molecular) organic materials have been discovered which have bistable states at room temperature, too. The threshold voltage across these organic films with a thickness of 60 nm is 4-6 V and the transition time is 5-10 ns. Therefore, they are suitable to make ultrafast, non-volatile, organic memories (WORM or EPROM). Another possible application for an STM type ultrahigh-capacity memory is also illustrated.