The program can show the countdown in two ways, either in a nice font in a small window, or in the title bar of a minimal sized window. Besides that there are options to print the amount of seconds left. Option -h will give you a full list of options.
Even though the above 2009 event has already occurred the source can still be easily adapted to create a counter for any event.
A few screenshots
I also created a counter that can be used with a web server, see below for the source.