There's a new service for GPS-enabled cellphones called uLocate that makes it possible to easily keep tabs on your friends and family, allowing you to see their exact location on a map, 24 hours a day; review everywhere they've gone throughout the day; and set up and automatic alert if the person goes outside of a pre-defined area. Right now uLocate only works with a few select Motorola phones and Nextel's Total Connect cellular service, but support for more phones and carriers is in the works.

We're beginning to think that GPS tracking of children is going to be a huge issue in the coming years. Sure, we'd all like to be able to instantly know where our children are and that they're safe and sound (it's hard to quibble with that), but can you imagine how completely and utterly terrible your own teenage years would have been if your parents could have tracked your every movement?