I use instamapper. You can find it in app world as "GPS Tracker." I use it because it has the best facebook app.
It's a battery sucker though, so I only leave it active when I'm on the move.
Latitude can perform similarly but the facebook app barely even works and the google maps app itself does not run well when left in the background, it would only update my location regularly when running in the foreground. In the background I'd be lucky if it updated my location online more than once every 20-30 minutes.
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Andy
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