Maybe I am biased (sorry... analog pun :-)), but based on my experience this past Labor Day weekend... I have to say that PCs are more analog than digital. I built a new PC over the weekend, based on an Intel Core-2 processor. Take a look at this cooling tower that comes with the boxed 65nm CPU. There is a copper heat spreader, attached to a cylindrical heat sink with many fins, all topped off with a cooling fan. It is pretty amazing to me to see what it takes to keep the chip from melting down.
It made me think about the "low-power" design techniques that must have gone into the SoC, and how this has become such an important issue in IC design and verification flows. You can find new articles on the topic almost daily, from EDA vendors and designers alike. The Magic Blue Smoke blog is one good site to check out.
But, in the end, making the PC work relies on thermal management like this cooling tower... and that's definitely an analog designer's creation. The tower is just one part of the thermal management system, along with front & back case fans, a separate fan on the graphics card, heat sinks on the rest of the chip set, etc.
The distribution of power to the various PC components, also an analog design problem, became an issue for me when I overlooked the need to attach a second (2X4) power connector along with the main (2X12) connector to the motherboard. Low power indeed!! I needed a 2nd PC to read the PDF installation guide to discover my mistake on that one.
Finally, I got the PC to boot up but with no sound. Ugh, another analog problem. I haven't solved that one yet, but I'm sure it will be nothing compared to the problem of porting my old data files and programs to the new PC. Now that's a software problem!! But I'll save that for another time.