Latitude is interesting, but it lacks a couple of things to make it truly usable, like an auto-shutdown after 2 hours (or any length of time). Most people end up leaving the stuff on all the time because it’s a hassle to go in and stop it. The GPS would add extra drain on the battery. Secondly, the iGoogle Latitude window is ridiculously small . I’m not even mentioning the fact that you need a Google account. Latitude should give one the option of sharing a non-secure location via Google Maps. Glympse is arguably a very interesting alternative.