The solution for people that don't want to rewire their entire house, just to be able to hook up the computer to the network.
I know, there is wireless, but nothing as fast and sturdy as a wired connection.
The solution is as simple as brilliant, plug your networkcable into an electricity-socket of the household power grid, your modem into another ... and yes, this works! Speeds upto 200mbs.

http://www.devolo.com/co_EN_cs/produkte/dlan/dlan200aveasysk.html

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O wow thats sweet! You're rigth, i also do not want to use wifi in home because just copying large files from one pc to another takes forever. *This* i like!