  The isostructural metal-insulator transition in Cr-doped V2O3 is the textbook
example of a Mott-Hubbard transition between a paramagnetic metal and a
paramagnetic insulator. We review recent theoretical calculations as well as
experimental findings which shed new light on this famous transition. In
particular, the old paradigm of a doping-pressure equivalence does not hold,
and there is a microscale phase separation for Cr-doped V2O3.
