An app to log GPS usage?

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I used to like keeping gps on even if I'm not using it, so that in case my phone gets lost or stolen, I can track it down. But sometimes I check my home screen and see that gps is active (the icon in the notification bar) although I'm not running any apps (even in the background) that would require a gps fix.

So my question is, is there an app out there (or is it possible to develop such an app) that would keep logs of what apps or services are using the gps, so that I can track down the app using it?

It would also be useful to find out if there are any apps 'calling home' without my knowledge, and draining my battery in the process.

So..any suggestions???

Just a shameless bump...come on, no one has heard of such an app or thinks it would be useful??