I don't think that's the answer he's looking for. Likely, you wanted to know if there's a way to send an SMS message to remotely turn on the GPS tracking and locate the phone's physical location in case you lost it or had it stolen. I know I have one of these types of applications on my Droid, especially handy after having had one Droid already lost/stolen from me a month ago. I didn't have such an app.. and now I do--and I'm VERY glad such an app exists.

Dealing with the bureaucracy of police/telco trying to find stolen goods almost never turns up anything--especially since they need subpoenas to do almost anything useful.