This could replace my current time zone tracker app, @-time, due to its convenient spot in the menu bar.

But I've got a lot of other menu extra bits up there as well, so space is precious - is there a way you could add an option in the Appearance Preferences that will result in a small icon (say, that of a tiny clock?) appearing in the menu bar while all the time zone info is stored out of sight? I only want to see the info when I click on it, not before.