There’s a brilliantly observed article on mobile child tracking services in the States on Kelly Goto’s www.gotomobile.com.
As a parent, I can identify with the insights. I grew up in a small town in the 1970s and enjoyed far greater freedom than we seem to be able to offer our own boys living in a 21st century city.
In particular, the article notes that the age of the kids makes a huge difference to how the service would be perceived. Age 6 to 8 seems to be the sweet spot for parents wanting to give their kids freedom to roam, although of course:
Most kids between 2 and 8 lose anything that is not permanently attached.
I can identify with that one too :)