If you run load-balanced ColdFusion servers, it can often to difficult to determine which server a notification or error message originated from. There's a nice little Java trick to get around this.
We add this line to error notifications on our site so that we always know which physical machine the message came from. This makes it a little easier to diagnose a problem, determine if it is limited to one server, and know which log files to look at.
This is also great if your site is responding a bit slow and you want to know which server in the setup you are hitting from your machine. We set up a small script called whereami.cfm that simply displays the machine name.