User Interface Engineering

User Interface Engineering is a leading research, training, and consulting firm specializing in web site and product usability. They provide many fee-based services such as conferences, usability training, and publications. A list of free articles is available here . Interesting titles include:

Six Steps to Ensure a Successful Usability Test
What Makes a Design Seem 'Intuitive'?
5 Things to Know About Users
Users Don't Learn To Search Better

User Interface Engineering also sponsors a three day Know Your Users seminar, which covers techniques for understanding user needs (including field studies, personas, and usability testing).