There is a company called Savant who designs, develops and manufacturers deliver home control and automation, multi-room audio/video, advanced digital audio and video processing, extremely flexible and scalable audio/video switching, digital media server and jukebox capabilities, and an array of integrated applications and services.
The fact that I mention this company here is because traditionally this has been a pretty top end set of products which were accessible only to those with a lot of money.
If you’re looking to do home automation, you’ll spend at least $10,000. Savant’s system is called Protege. It’s a box with a Mac Mini that will control a mid size home for $5,000, and you can control everything from your iPhone or iPod Touch.
I also got a look at the TrueImage Control, which is a visual system to control your lights, TV, etc from a touch panel.