We have been working on something behind the scenes recently that brings up all sort of issues of privacy, our worries pale into insignificance however compared to the twisted genius that is http://pleaserobme.com/
The site uses terms such as 'left home', compared to your profile to work out your not around, it then links to a map showing where your now empty home is (assuming you live on your own). Genius, as is the sites discaimer 'Our intention is not, and never has been, to have people burglarized.'
See http://pleaserobme.com/ for full details and a list of opportunities for those so inclined...