Another one that would qualify, would be the the App for Spot. It does require you to have the Spot Communicator, but enables you to send custom sattelite text in addition to the norm Spot features. One thing that is cool about that, is it can update your location on a map that your wife or family and friends can track from home via Google Earth as well as let you update Facebook; though I probably wouldn't use that function (dont want my "Secret" spot to become public knowledge, afterall - LOL).
?-ERock-> ?