Here we have a further evolution, spanning multiple rooms by bridging the network access over powerline ethernet. This can work over much greater distances than wifi (although at somewhat slower speeds given the current speed of wireless - that’s still probably okay for most uses), at roughly the same cost. We’ve also split the network conceptually into “office-side", which is wired with a high speed transfer gigabit subnetwork and “entertainment-side", used for low-bandwidth external facing applications (PVR, game machine) that currently have little comparative need or capability to transfer large files to and from the rest of the home network. This also gives you the ability to easily add another NAT / firewall box in between the two so that when someone finally gets around to putting out a worm that propagates through one of the gaming consoles, the rest of your computers are somewhat isolated.

(See part 1 and part 2)