I did consciously keep Startup News simple because I knew a news site would be something a lot of users viewed on handheld devices. I didn't plan for the iPhone specifically, but they all have small screens.
The limit of 70 characters per line on your website makes your essays easier to read -- whether on a large screen, printed, or more recently, on the iPhone. I've always liked that. A while back I started resizing wide texts in my browser because I realized from reading your essays how much easier it is to read smaller columns of text.