Wired

It appears that we can do what we wanted to, with the lamp post, and it won't be too difficult. No digging, no punching cable holes, none of that.

We just replace the existing light switch with one of a two-switch set from SmartHome, and then put the second switch anywhere -- we'll likely put it just inside the front door. That switch will wirelessly communicate to the first one, letting us control the lamp post light from the entryway, rather than having to go downstairs to switch it on and off. About the only odd point is that the wireless switch runs on batteries. Course, given that the transmitter will only be used four or six times a week, I'd imagine they'll last for a good long while.

Neat.