There have been a whole crapton of bike thefts in Philly this summer. WAY more than any other year that I can remember. I heard a rumor of three young kids going around with a cordless grinder and demolishing U-Locks under the cover of darkness - this is what Trophy Bikes does if you lose your key...but in the daytime.
Anyway, I was about to post something about this on CL (there have been a number of posts about bicycle theft prevention), when I wondered if a potential bike thief might read it and go buy a cordless grinder. Additionally, someone posted a long list of things to photograph like serial numbers, various details, etc, but didn't mention taking a picture of yourself with the bike and sticking it in the seat tube - a good tip, but again it's information you wouldn't want to give away to any potential thieves.
What do you think? Good info for cyclists, but bad info for thieves. And if there are in fact kids with a grinder, it'd be a good thing for people to keep in mind, but the last thing we want is MORE people with grinders.