Latitude. So that burglar can know exactly how far you are from home.

That is the one of the biggest loads of crap I've read in a long time.
You have to install and enable Google Latitude on your phone plus those you can disable it at any time you don't want your friends to track you.
There is no security issue at all. You would have to add the burgler, stalker or whathaveyou to your friend list to allow them to track you. Should a friend list feature be unavailable (in which case, I would bet Google is working on adding it), you can just not install it.

Actully most hackers are not that at all. It's a common misconception.
Just like anyone, what hackers do is just a hobby and it's not always bad.
Many geeks who play with the registry or "hack" system files are "hackers" but they aren't trying to do something bad.