I'm very curious to know more about the the transfer mechanism to the cooling wall. I can think of a few ways it might be achieved, but I'm wondering how involved (read: expensive) the method is here.
Regardless, that's genius. I can think of a lot of people (myself included) who'd enjoy a PC with those specs in that footprint. That leads to another question: will it work with the new 45W quad?
The method is really simple. CPU is connected to the cooling wall by a piece of solid aluminum, about 4 cm high. And the "cooling wall" is actually a channel, made of two plates of aluminum. That is, there are no fins or anything (which would have made it more complicated). I have done tests, and have found that the channel is quite an efficient way to remove the heat. So the material needed is really inexpensive, but of course one has to think a bit about the placement of HD, dvd, and tv-card (here a riser card is needed).
The cpu in this case draws about 45 W, so a new quad would be no problem (we have made similar systems with 65 W CPUs, and that is no problem, one just have to make the channel slightly bigger). There are some issues about dimensions of the channel, the optimal width of the channel is related to the other dimensions of the channel.