On so-called flat design: This visual style is all the rage in web design communities, but flat design has been around for decades. We usually call it graphic design.
Microinteractions: Designing with Details: An exciting new book on interaction design. The difference between a good product and a great one are its details: the microinteractions that make up the small moments inside and around the features.
Color Hailpixel: A new and easy way to create your own color palette on the web.
Call for Type: A well-designed site with an interesting and dynamic long-scroll experience. The typography exhibition, Call for Type, begins in June at the Gutenberg Museum in Germany.
Laika: Impressive, polished dynamic type generation.