Hoefler & Co. is a type foundry in New York City run by type designer Jonathan Hoefler. @mantia on Twitter solicited feedback on a new typeface he was designing, and H&Co gave a very extensive one. I haven't done type design before, but it was still quite interesting to see the range of thinking that goes into designing a type.
The Sprint Book by Jake Knapp with John Zeratsky and Braden Kowitz
Sprint takes you behind the scenes with some of America's most fascinating startups as they sprint on difficult problems. A practical guide to answering critical business questions, Sprint is a book for teams of any size, from small startups to Fortune 100s, from teachers to nonprofits.
A detailed blog post that shows the redesign process for a top 50 website - stackoverflow.com. I liked how they meticulously laid out the objectives, followed the The Sprint Process to come up with the redesigns and finally tested them out via user interviews and a battery of A/B tests.