Here's what I've done so far (unfinished!): http://people.bath.ac.uk/enpsgp/nokia770/latitude/

It consists of a daemon called latituded and a control panel applet to change the settings.

I hadn't quite decided how to handle the case of the use wanting to connect then disconnect at certain intervals, also have not added in the update code (which you obviously have in your app). Applet is also not finished.

If people think this is a reasonable way to go, please feel free to hack at this and/or combine it into the Garage project (though I'd still be very tempted to get rid of the heavy deps and just stick to a basic GTK+ control panel/ui for the time being)