Similar in theory to the MicroLink dLAN, the Marantz WEAVE lets you stream music through your electrical system to any room in your house, provided that room contains a WEAVE receptor.

Up to six ZC4001 receptors can be plugged in your home at once to receive audio, but to transmit audio you'll have to get a ZR6001 WEAVE amplifier or "receiver". The transmitting "receiver"—slightly confusing terminology, we know—and one ZC4001 "receptor" will run you £700 ($1,289) together, and extra ZC4001 receptors cost £200 ($368).

This is only available in the UK as of now.

Product Page [Marantz via Shiny Shiny]