Forgive me if this is a bit off-topic, but I reckoned that the typical reader of this forum would be interested. greedyflyza’s mention of his friend doing "Powerline Internet" prompted me to do a Google search, and I came up with a very interesting website (See http://www.powerlinecommunications.net). This is a very interesting technology and seems to already be supported by quite a few well known networking/wireless manufacturers (See also http://www.homeplugs.net).
Basically it allows you to extend Ethernet connectivity over the mains power lines within a building. If this "HomePlug 1.0" technology takes off and becomes a universal standard, it could make the “Smart House” a reality, where appliances are all networked together via their existing connection to mains power. Network speeds are presently up to 14Mbps but they say 100Mbps is possible. Devices must be on the same power phase and have a common grounding system. Interesting that the D-Link DHP-100 datasheet says "compatible with standard non-surge protected power strips. Not compatible with surge protectors". I wonder if the presence of any surge protectors in a building would adversely affect the signals – that would rule them out here on the highveld, and in many places in the world.