Automatic update might be a bit too much.
But a simple explicit 'check for updates' point in the about dialog might be okay.
But this would really only be a real useful thing if there was something in place like the Courgette delta updater used by the chrome browser (see http://www.chromium.org/developers/desi ... -courgette
), so the incremental updates were much smaller than the full update.
I doubt it would be worth the trouble.