Belkin's new Powerline HD starter kit claims to offer gigabit speeds through your home's power wiring. [Belkin]
Because of its high Gigabit speeds and consistent connection, Gigabit Powerline reduces online gaming latency and provides large bandwidth, making it ideal for online PC gaming and ultrafast high-quality transmission of multiple video streams. While the current fastest powerline technology runs at 200Mbps, Gigabit Powerline delivers content at 1000Mbps of speed.
My experience with this sort of gadget is that throughput drops hard and fast with distance -- a 200MBps model I tried offered only a few megabits worth of actual transfer over a 60ft run.
This one, however, is much prettier.