The app is actually called Force Ring and there is a review about it
here. Though I cannot find it in the Market, so I have to assume that it has been pulled for some reason.
But don't be sad, because there is an alternative! The app is called Where's my Droid, which has a free version with the same functionality as Force Ring, and also has a donate version that only costs $1.00 and has more functionality. You can read about that
here. Both the free and donate versions are in the Market.
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