On tech forums, this tends to get quite a lively discussion going.
Eh, I'm not going to weigh in my usual opinionated self on this one, mostly because most ground has already been covered.
However, for those who have a wireless router, and would like to prevent pirates from boarding, I highly recommend turning on encryption and changing the default password. (And preferably using more advanced encryption than WEP if it's available.)
Yarr!