I have always had a peculiar fascination with Apple's choices around wireless routers. I have quite often told people, when asked what my favorite apple product is, that it's an AirPort Express. That has changed since they switched to the current generation of them, however.
The Accidental Tech Podcast that was released today has a rather interesting discussion around the Design of the AirPort Extreme and routers in general. Definitely worth a listen as it really hones in on the importance of design for even those products we generally setup once and forget about.