My neighbour here has an unpassworded, unguarded Belkin 54g network. If I were to choose to, I could (illegally) log on to his router and change all the settings. I could also use his bandwidth to order porn, make bombs, or conduct all manner of illegal activity if I wanted to, and it would be traceable directly to him. Alternatively I could snoop his network packets and get his banking details... I hasten to add I don't do any of these things, but that's not to say nobody else is.
To my mind this makes Belkin rather negligent, and certainly very stupid - they don't even have a default password on their router! Let alone forcing the user to put WEP encryption on the network. It seems totally ridiculous not even to password protect the router by default. Surely the manufacturers should take at least some responsibility for protecting their users, even using the most basic precautions?
I'm not naive enough to think that my own WEP encryption is very secure, but at least I have a lock on the door. My neighbour has left his alarm off with all the doors and windows wide open.