Over the past week I've really enjoyed reading (and re-reading) Christopher Fahey's 5-part series of blog posts on user research. This thought-provoking and provocative series sets out Christopher's issues with much of the research carried out in the interaction design/user experience space, providing examples, caveats, pros & cons.
The series is, I believe, a much-needed dose of scepticism and critical analysis of our discipline's love-hate relationship with research, and the results derived.
An absolute must-read for anyone involved in the design of Web sites and applications based around user research.
Make sure you take the time to read through the various comments & Christopher's responses. They contain some interesting perspectives on the issue from other practitioners (including myself).