Most of these have been pretty well known or obvious, which is why those that do them have little excuse. But I disagree strongly that #1 is a problem. Some things, like the header in his example, usually should be full width. While others, especially columns of text should be of a fixed maximum width to improve readability. Who cares about blank bars to the sides of the screen? Or at least, who cares as much as they do about struggling to read too wide columns of text?