Pretty cool marketing tool, but probably not all that practical- no guarantee delivery time (at least not on the front page), and hour-old in-n-out burger/fries/shakes pretty much ruin the in-n-out experience.
Oh, and when some enterprising HN'er gets that working, I also want a Web 2.0 site that will let me create virtual Mongolian BBQ entrees and have them delivered with ingredient choices and quantities as specified.