IP in menubar worked for a while, even in Leopard, but suddenly it refused to show the external IP. It only started showing the local IP and I could find no way to change that.

So I had to resort to BwanaDik, which works well, but you have to click first to see your IP address. IPmenu works well too, but the same thing: you've got to click.

Hope to find an app again with the external IP address straight in the menu bar.