Depends on many factors.

For example with how many people you live.

Or if the place seems abandoned.

Here its known East Europeans put hardware spyware on ATMs and drive around to notice paterns who is home when. So I tend to go to specific ATM locations, check them out, cover my hand when typing PIN. For the latter I tend to leave quickly, always have my lights on, and always have (soft) music on. Its just that many factors add up. How you look. How your home looks from the outside.

..but I heard the other day that when kids are supposed to be on school and they're blogging the compulsory_education_officer has a word with 'em. Funky!

I think Benson's post is a very good one to start with when dealing with this issue. I also believe my point about the accurary of the position is a valid one. And, I believe it is possible to define your friends and define who sees what. Eventually, after the hype goes away, I imagine it will be easy to tell a contact your (approx) location, but I imagine it won't be shared with the whole world or even all your contacts/peers. And, I believe something similar will be true regarding blogging and social network sites. And regarding a generation shift: I sure as hell would not want my kid to share her exact GPS location with the whole world. Sooner or later it will be in balance based on usability and security. It just requires some time, and (painful) mistakes.