In response to the 2 requests below:
1. You should be able to create multiple instances of the widget (drag multiple times from the widget dock) to check on multiple ET servers. I know not the most glamorous solution, but it works.
2. You can enter domain names into the IP field on the back of the widget and it will work just as well. Give it a try, it is working for me, but if you are having issues with it please let me know.
Thanks for the feedback!