There's a reason why we keep bringing this up! It's an easily digestible, quick read that explains the value of UX in the library world, encouraging librarians to begin designing spaces and services with their patrons and communities always kept in mind. The book is organized in a series of checklists and recommendations for improving specific checkpoints in your library - everything from your website to your building signage.
(For websites.) Usability guru Steve Krug's guide to understanding the principles of intuitive information design. Witty, practical, and filled with common sense.
A powerful primer on why some products satisfy customers while others only frustrate them. (Cover photo: a "teakettle for masochists," featuring a spout right above the handle.)
Design thinking is an approach to improving services and products through creative problem solving. This free toolkit from IDEO.org will guide you through user research and brainstorming so you can rapidly prototype a new program, service, or setup at your library.
NovoEd offers free online courses for people who want to try their hand at human centered design (a.k.a. "design thinking"). If you time it right, you might be able to jump into "Design Kit: The Course for Human-Centered Design" - it's offered a few times a year.
Tweets and presentation slides from an ALA session about user research methods and UX philosophy in libraries. Intended for participants new to the concept of user testing (and with limited budgets).
LibUX hosts a podcast with guest interviews featuring UX professionals and thinkers from the library community and beyond. Their new bonus Q&A podcast series aims to answer fundamental questions about UX for library folks who are new to the topic.
With a solid understanding of their patrons and the way a person's relationship with the library evolves over time, librarians can tailor outreach, marketing and programming efforts to captivate different audiences.
An OCLC report about shifting patron priorities and behaviors in public libraries, and how we can leverage awareness that relationships with libraries evolve throughout the course of a person's life.
Using cheap sensors to create "a Google-Analytics-style dashboard for your library building: number of visits, what patrons browsed, what parts of the library were busy during which parts of the day, and more."
Useful, Usable, Desirable by 
Don't Make Me Think by 
The Design of Everyday Things by