A List Apart has just put up their second article about web sites developed for iPhone. In it, they discuss some of the limitations and difficulties of the device, such as:

There are also issues that arise because of the simplified user interface. After using the phone for awhile, you’ll notice that there are no open or save dialogs. Indeed, there is no file system that’s visible to the user, so it’s not surprising that the <input type=”file” …> does not work—there’s no way for a user to pick the file to upload.

The author describes everything from optimal screen size, font size, colors, memory limitations, downloads, fonts, and more.