An interesting point of view from Wired on why you don't have to have secure wi-fi. It's easy for me to agree since we live in the "middle of nowhere". However, the concept of good neighborliness is interesting and it works - in the past I have in fact eavesdropped on a neighbor's open wi-fi network when my own server was down and it saved me time and inconvenience. I would like to think I have reciprocated this impromptu service to others.
The legal ramifications are interesting (see the article) and only the paranoid would probably actually have to worry. I mean, do hackers really sit in cold cars outside your home when they could do the same mischief in the comfort of a warm café?