On the very first page that was linked, all of those headings are expanded, including: "Navigation and IA: 29 guidelines to evaluate navigation and information

On the very first page that was linked, all of those headings are expanded, including: "Navigation and IA: 29 guidelines to evaluate navigation and information architecture.". This is further used as tooltip text when you point at the actual link with the abbreviation. As for scroll stoppers...it is very clear to me that the page's main content has ended when I reach even the "first" footer. It hardly seems like a principle violation. "Usability Training" might be a subtlety in the footer, but it is also one of the major headings (which are obviously buttons). And while I'd agree that browser widths shouldn't be assumed, their advice in #29 is with respect to reading, and there is definitely research to suggest that there is a maximum useful width for a column of text, ~60-70 characters. [See for instance, "Readability of Print" (H. Spencer, 1968).]