Slightly tangential to this discussion, but Philips have just released their Hue system in the US. This zigbee networked lamp is a good indication of where the future lies, with every light bulb we own being a network device that can be controlled individually and as groups. A certain large search engine company is heavily invested in this area as they really, really want to be in our homes (the Internet of things is getting ever so close now).
Hue does look interesting and gives some indication of where LED lighting is going.
Www.meethue.com
Next stage is getting rid of light switches and, instead, having NFC readers behind the wallpaper - wave your phone (or hand if you have chosen to have the NFC chip embedded) over the reader and the lights turn on to your personal settings.
The future's so bright, I gotta wear shades!