Not the kind that we're all thinking of, though:
http://www.theregister.co.uk/2010/06/03/microwave_blackness_dingus/
The device traps microwaves coming from all directions and "spirals" them in to its centre, converting them into heat with 99 per cent efficiency. Thus it is "black" in the microwave band - and its builders, Qiang Cheng and Tie Jun Cui of the State Key Laboratory of Millimeter Waves at Southeast University in Nanjing, believe that similar devices could be made to work in the visible spectrum also.
The absorber works using metamaterials, cunningly structured so as to bend electromagnetic waves in interesting ways. 60 concentric rings of copper metamaterial attached to circuit-board backing guide incoming microwaves into their centre. According to Cheng and Cui:
Since the lossy core can transfer electromagnetic energies into heat energies, we expect that the proposed device could find important applications in thermal emitting and electromagnetic-wave harvesting.
The article goes on to obsess about possible applications in stealth tech, but I think more interesting possible applications exist in fields like energy harvesting and transmission. Others have suggested that it might come in handy as radiation shielding for spacecraft.
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