This is a good idea,
Local Address: http://(127.0.0.1 or localhost):Port
Internal Network Address: http://(whatever my internal static network IP is):Port
External Network Address: http://(find whatever my external IP is):Port
I like it... but i think maybe a drop down would be better... so the user can hit the drop down and select which they want to view in the address bar, the internal network IP, external IP, or localhost... like a mini menu, with 'Retrieve and Show External Network IP', 'Show Internal Network IP', 'Show Local IP'
I think 2 address bars would be annoying. I am behind a router >_<.