As good as Google's Chromecast is at putting streaming video on a big screen, its dependence on WiFi can be a problem -- just ask anyone who's struggled to play YouTube on a barely-connected basement TV. Thank goodness Google has just rolled out a Chromecast Ethernet adapter, then. It's really a glorified power brick, but the $15 add-on should give you a rock-solid data link wherever your set happens to be. It could also be a lifesaver for those places where wireless just isn't an option, such as a behind-the-times hotel or boardroom. While the adapter is only available in the US right now (sort of -- it's already sold out), it's easy to see this shipping elsewhere in the near future.