I hadn't heard of this device until recently, so I bought one to try it out—the Logitech Xbox Play Link. It is a discontinued item, but it can be easily found [new] on eBay (got mine for under $30 shipped). Setup is painless—connect one module to a router (or modem) and the other to the ethernet device you want to extend. It is rated at 1.5Mb, but in performance tests I got about half that. Note that it uses RF and not Wi-Fi, so there is absolutely no configuration required. This device will work with an Xbox (go figure), a computer, Vonage box, or whatever.

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