Milkie - why cat6 cabling. Why not rely on wireless?
Wireless speeds are relatively slow, fastest at the moment is 200mb/s, and you'll be extremely lucky to get that, you would have to have repeaters setup all around the house to boost the signal too.
Not everything comes with wireless, new TV's have a LAN connection, but no WiFi. Cat6 cables can go up to 10,000mb/s, for a home you should be looking at 1,000mb/s. Mean's you would be to watch HD films directly off the server, rather than having to copy it to the device and then watch it... If its a HD film you are talking over 6Gb, 6Gb on a 108mb connection would take about an hour (or just a long time) to copy. Once it's setup, thats it done, no fart arsing about setting up keys, repeaters and things, not the sort of thing that gets updated every year like wireless things.
But if it can mix a G&T and have it ready for when I come out of the shower, this Automation stuff may be a winner!
Yes, with a little engineering! But you could do things like, having the lights turn on for when you come home. If you are away, you could get the lights to go on and off, turn the radio on/off etc. All via your phone!