Polariton BEC

The cond-mat Journal Club has a thing on polariton BEC with a commentary by Peter Littlewood who's a relatively important figure in the field. I'm not super-familiar with the literature but there are two basic reasons to be interested in polariton BEC: (1) it's pretty high-temperature and might actually be useful, (2) it's intrinsically very non-equilibrium as the polaritons owe their existence to the pump laser -- this has some rather neat implications, at least if you like far-from-eqm physics, like the observation that the Goldstone mode goes diffusive at very long wavelengths, and therefore these condensates aren't unambiguously "superfluid."