Pretty cool, could use a little work though.
The clock counts down second-by-second. In the show, the clock only counts down second-by-second when it reaches the 4 minute mark. Otherwise, it should just count down by the minute (108:00, 107:00, 106:00, 105:00, and so on).
The clock graphics are a little weak. The terminal part is quite amusing, with its humorous messages.
Some sort of full screen mode would be pretty neat, so the terminal would take up the entire screen and the clock would display at the top center.
All-in-all though, it's quite neat. I've been waiting for something like this to come along.