I think this is interesting coming from people who develop and release email software what they find appropriate and deem 'good' to do in a business related email setting.
This is a really simple, yet effective, example of how repeating layouts, fonts, and colors throughout a web page can be beneficial to organization and flow.
Interesting historical and abstract uses of design in art. Accompanied by great commentary and discussion of what the particular emphasis of the piece signifies.
Some interesting ideas considering different approaches to emphasis as it concerns design and expands on different concepts than chapter 2 in greater detail. Also provides great visual aides.
Some more advanced principals of design that can be used to attract readers. This particular page goes over how elements in web page design can be put in balance to create greater (or lesser) impact to an audience.