In the last two years, mounting evidence of possible excitonic insulators in two dimensions has been accumulating, as layered materials combine optimal band structures, poor screening behavior, truly long-ranged interactions, and giant excitonic effects. New electron-hole bilayers hold promise of room-temperature superfluid behavior, whereas signatures of the long-sought bulk phase were found in monolayers. Excitonic materials exhibit other kinds of order as well: a variety that includes topological insulators, ferroelectrics, unconventional superconductors. This introduces new urgent and far-reaching questions, concerning the role of excitonic correlations in a plethora of allegedly unrelated phenomena, whose interplay is just beginning to be explored.