Mologogo is a new and free application meant to track stuff/persons (alpha service):

"Mod a GPS enabled Nextel and fauxjack yourself or your car, or your kid, or a big dog, or an elephant. We really, really want to track an elephant. Mologogo is a free service that will track a "friends" GPS enabled cell phone from another phone(gps not required) or on the web. It currently works on pretty much any Nextel phone with Java and GPS - even a $60 no-contract Boost Mobile phone.

Mologogo is totally "alpha" right now, but improving rapidly. It is was built as a Web 2.0 app, so expect integration with sites like Flickr, Upcoming.org, Judy's book, and lots more RubyOnRails/AJAX-y goodness added to our UI. And with our soon to be released API, you'll be able to access your own location data in other sites."

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