BT have been doing this for years with their home hubs, with BT FON. It's enabled by default, but you can disable it, although you have to disable it on their account management site, and they then tell the router to disable it (sounds a bit wierd to do it that way, but there you go). I use my own router though, and BT are happy for me to do so, which stops any potential issues anyway.

On my few trips to the US, there's something I've always been a bit wary of, yet it seems common practice... When I pay for things at the checkout, I hand over my credit card, they give it back to me, then I sign for it without having my signature checked to see if it matches the card.

Over here (UK), I know we have Chip & Pin now, but before then, the cashier would keep your card and check your signature against the one on the card before handing it back .I used to do that job, once had a guy sign nothing like the one on the card, claimed it was his boyfriend's card. As per company policy, I rang the bank's authorisation phone number, they told me to destroy and return the card to the bank!

For some people, I imagine the most popular is actually Tools -> Start Private Browsing :-)

When I looked at the number of SSIDs in my street so I could do the poll, one I've not seen before was visible: "Bum".

In that case my house is safe... my entire town hasn't been put onto street view yet.