During the last decade modern preparative and structural methods have led to novel and often unexpected oligomeric and polymeric main group element-sulfur compounds having remarkable bonding and structural properties and reactivities. Examples of important new developments in this area are: the discovery of boron sulfides B& and (BS2), and of ionconducting air-stable thioborates with tetrahedrally coordinated boron; the successful use of boron sulfides in organic and inorganic syntheses ; the preparation of different homologous series of molecular polynuclear thio-and selenoanions of Ga, In, Si, Ge and Sn, and of new polynuclear sulfide-and selenide-halides of Si and Ge as interesting reagents for inorganic and organic reactions; the synthesis of argyrodite(Ag8GeS,)-like phases with remarkable solid-state properties; and the characterization of the S-H . . . S type hydrogen bridge in thiocarbonic acid and thiophosphinic acids, which is of importance for an understanding of certain interactions in sulfur-containing biomolecules.