I think it is useful to know where people are at what time when at work. I don't have a problem with that kind of monitoring of my movements.

Outside of work in personal things I could see that you might want to switch tracking on in certain circumatances eg Journalists in dodgy areas females who have recently split up with partners who are behaving erratically.

Whatever you do though you are going to need heavy filtering tools.

And it is open to abuse. Partners can also use this stuff to monitor their partners in inappropriate ways.

Regards important work stuff I generally put it down in my blog.