You may have noticed that a more usable, intuitive flat UI form involves some degree of redundancy. It’s often not just one visual design component (e.g., color) that communicates difference. Instead, it might be color and shape, or color and size.

Jessica Enters, Flat UI and Forms (in A List Apart)

Tl;dr: if you have a flat design, be careful not to let you form elements blend in too much and get washed out.

…who the heck is visiting page 964 of 3810?

Jeff Atwood, "The End of Pagination"

As you can imagine, the comment thread is exactly the kind of potpourri you’d expect from this topic.

We see a lot of feature-driven product design in which the cost of features is not properly accounted. Features can have a negative value to customers because they make the products more difficult to understand and use. We are finding that people like products that just work. It turns out that designs that just work are much harder to produce than designs that assemble long lists of features.
— Douglas Crockford (JavaScript: The Good Parts)