When talking to people about digital home systems there are two ways to look at it. The first way is to have it in mind when you get your house built, which means a lot of pre-planning on your end, extra upfront cost that may or may not be relevant, and working with the builder to see if they are willing to deviate from their standard design (in the case that they do not traditionally offer digital home upgrades as was the case when I built my home two years ago).
The second way to implement it after the fact. This can be a bit difficult to do. Take mounting my TV on the wall. This should have been a fairly simple project as it is something that many people are doing today given the small size of TVs. But mounting the TV was more than just putting up a mounting bracket and hanging the TV. It required getting an electrician in to install a power socket because the code states that the power cable can not run through the walls. As well, a hole had to be put in the wall to run the cables. Because I did not want to have a large number of cables going through the wall, I also added in an HDMI switch so that only one cable needed to be run.
A few years ago at CES I saw companies demonstrating wireless HD transmission. But these technologies had a number of issues, including relatively low range, signal degradation, latency and low resolution. Since that time, new technologies have come out, such as the Wireless Home Digital Interface (WHDI) that offer a way to set up wireless systems that will deliver high quality signals, without latency, throughout the home.
One of the reasons this interests me, other than the fact that you can place TVs throughout the home without having to run wires, is that it is potentially another method for the multi-room DVR that I have been trying to find a solution for. And potentially it is even more adaptable than simply a DVR as any input signal can be transmitted, meaning that DVD players, PCs and gaming systems can all be seen via other TVs than the one they are connected to.
The downside at this point is that most of the receivers are built into the TVs themselves, or you have to add in another external box to receive the signal. While I believe there is promise here, I am not sure it is quite ready for mainstream adoption yet. But given a bit more time to get developed and some visibility in the market and it is something definitely worth watching.