Thanks John that's pretty nifty.
I have one to add. This little add-on is a dream for me!
http://flagfox.servehttp.com/Flagfox (an add-on for Firefox only) will show the country's flag of wherever the server is located for the website you are viewing. Move your mouse over the flag and it will give you the IP address of the webserver. Click on the flag and it will give you a detailed map of where the server is located. And even better, middle-click (that's click with the scroll wheel if you have one) and it will do a WHOIS lookup on the domain name for you! It's one of the most useful Firefox addons I have.
Of course, I used Gmail Notifier, AdBlock Plus, and CookieCuller more often in Firefox, but Flagfox is the coolest.