Sometimes wireless actually means Internet-less. The structure of a building can interfere with a WiFi signal to the point that it can slow throughput, cause frequent interruptions, or prevent any connection whatsoever.
Powerline HD Ethernet Adapter HDX101
I decided to test the HDX101 with a home computer that used an 802.11g wireless network to communicate with a router on the floor below. Because of the structure of the house, the connection varied from good to weak; the biggest problem was with a VoIP phone service where voice quality was usually miserable and calls were often lost in midstream.
The HDX101 adapters are not large -- each is about the size of a desk of cards and has three status LEDs that indicate power, network status, and network traffic. It is strongly recommended by the manufacturer that you don't connect the device to a power strip, extension cord, or surge protector -- this means that you may have to dedicate an outlet to the HDX101, since it could get in the way of other plugs. (On the other hand, I plugged the review unit into the lower socket of an outlet, and was still able to use the upper.)
Installation of the two HDX101 units was frighteningly easy; it took less time than it takes to describe the process. The improvement was immediate -- Web surfing was perceivably faster, especially when it came to video viewing. As for the VoIP, that went from being unusable to reliable -- there were no more call interruptions, sound quality became quite good, and I was actually able to use the service for important calls without bringing out my lucky rabbit's foot.