Why have both a computer and a desk when you can combine both items into one convenient package? That's the idea behind this custom mod, which built a computer right into a desk.
Of course, this makes upgrading either the desk or the computer a lot more difficult, but fortunately, the water-cooled PC installed inside looks like it'll be more than adequate for some time. And I guess the desk looks OK as well. I'll probably stick to using a laptop, but more power to people willing to put a bit more work into things.