i have a friend who has a laptop with wifi and uses his next door neighbours internet connection, so im thinking its not that secure!!!
also, if you drive around with the laptop you can see who has wireless internet, and log onto about 50% of peoples internet connections by joining an unsecure network..
I've also noticed this Daave. Even though these sites have added security, showing the local networks does not leave much to the imagination what neighbour is on broadband. I believe though you can hide your existence by making yourself invisible which they have both failed to do. They also say that professional hackers can easily break the codes if they wish.
Wired ethernet is more secure. Even with WPA encryption on a wireless network, the packets are still exposed to anyone and everyone to collect and attempt to decrypt at a later date.
SSIDs can be sniffed out using Kismet or Ethereal. Not difficult at all.
The very fact your data is flying through public air space instantly makes it less secure than a wired solution. I've yet to be convinced otherwise yet, though WPA2 might be the solution.