Carusotto et al. (preprint)The Italian team has constructed an acoustic counterpart of a gravitational black hole out of a flowing one-dimensional Bose-Einstein condensate. The velocity creates a sonic barrier, a version of the event horizon.
And this "acoustic black hole" indeed does emit Hawking radiation composed of phonons, as demonstrated by long-range patterns in the density-density correlation function of the gas i.e. by everything strange about the picture above away from the yellow diagonal line.
I haven't told you one more disappointing thing. Even the acoustic "experiment" has so far only been done numerically. Some skillful experimenters will hopefully do better. ;-)