Whenever I load up a new machine, it seems that I forget where this is and I have to go find it again.  Mike's Ad Blocking Host File is a list of common ad servers, called the  on the internet that, when added to your HOSTS file, redirect the requests to these servers to 127.0.0.1 so that the requests don't escape your own environment.   Thanks to Mark for reminding me where it is this time.