I discovered Glympse by using the new Windows Marketplace for Mobile, which goes to show you just how powerful that piece of software is going to be.
In short, Glympse is a free, easy to use, no strings attached application that allows certain contacts you select to track your location/travels in timed increments. Think of it this way: say you are taking a road trip to visit some friends and you think you'll be there by 4:30pm. Well, with Glympse your friends can see exactly where you are on that trip without bothering you (i.e.getting that call while driving "How much longer do you think?").
I gave this app a quick spin and came away impressed. It's both visually appealing, simple, effective and kind of fun to use. Best part is there is no signing up, enrolling or hoops to jump through. All the other person needs is an email/sms account and access to the internet to click a hyperlink.
Take a look after the jump to see it in action and how it works.