When I initially typed in my zipcode and smacked Enter, nothing happened. At all.

I tried again with a neighboring zip, but this time I hesitated for a moment to make sure I entered it right, and the search box did a weird thing where it popped down an expanded city name along with the zip code. I clicked this and THEN smacked enter, and I got a search results page!

Of course there are no results in my area (and no way to tell how large a radius it considers "my area"; should I try again with a zip a few miles away? a few dozen miles away?), but now I know there's a secret-knock to get into the site.