The Ultimate Smart house is hear but not affordable at this time but soon we will be able to equip our homes to emulate "Sara" from the sci fi show "Eureka" when she sets preferences in the home pours a beer when you walk in the door and monitors your vital signs... yes all of this and more is just around the corner.
Just a few years ago in Las Vegas more and more builders were including CAT-5 wiring in their electronic packages some as standard features to run low voltage systems over like network connections, voice communications intercom and multimedia and lighting systems.
The market is still there but at a price. We will have to wait to the market improves and until we can make convincing argument that a smart refrigerator is a good buy or installing a PC in the kitchen is a must have.
If you have questions about this subject I am familiar with most of the home network systems and can direct you in the correct direction. Jason