Here's the widescreen version of +44 on Letterman:
(If the link below doesn't work for you, 44disasters.com is also hosting the video)
http://files-upload.com/files/7869/Plus_44_-_When_Your_Heart_Stops_Beating_.mpg.html
(MPEG, 640x360, 38MB)
*Scroll down to the bottom of the page where the counter thing is
Google Video