For even more stress: A countdown timer directly in your editor!
To give so more motivation (or stress) while developing your Ludum Dare game I made a simple plugin for Sublime Text (2 and 3) which shows the time left in the Ludum Dare!

A sublime text plugin to show a countdown for the Ludum Dare
In the bottom left corner you’ll see a countdown which show the time until the Ludum Dare starts. But more importantly, it shows how much time you have left!
Check it on https://github.com/FakeYou/sublimetext-LudumDareCountdown
(The package isn’t available in the wbond repository yet so you’ll have to manually download and install it for now)
Feel free to leave any and all feedback and bugs you encounter.