I found a 2010 Computer article on "emotional and cognitive overload" (ECO) pretty interesting, at least in part because this is a sort of overload I often feel. The authors point out that one source of ECO is the need to deal with ever-changing web interfaces, best exemplified in my recent experience with the nonsensical changes to Gmail, Google Docs, Blogger, etc., though Gnome is another good example.
I am not saying the authors are wrong, but rather that this glitch in their presentation should never have gotten past the reviewers or the editors. Computer is usually better than this.
The article is A. Rutkowski and C. Saunders, "Growing Pains with Information Overload," Computer, June 2010.