The paper ran a story last week of a couple taken into custody after being raided and their computer confiscated for child porn. A few weeks later, they found out it was an ISP error. Cops gave them the offending IP which was mistyped, returning an address of the innocent residents.
Although vaugely related to the above topic, I'd think stories like this would scare people into locking down their wide-open APs. I sure as hell am not going to jail so some passer-by can get their jollies off or their music fix on my dime. Try explaining that to the cops.