Obviously this isn't the kind of thing you curl up with for fun on a Friday night, but even judging by the standards of textbooks I found Case's Looking for Information a ponderous slog. I read this in conjunction with my Assessing Information Needs class, and in effect the entire work is simply a massive literature review on that topic, one which almost strangles itself on its own in text citations.
Early chapters introducing information behavior and offering examples are decent if uninspiring, and the fifth chapter on concepts related to information needs and information seeking (such as relevance, salience, selective exposure, etc.) is actually something approximating readable. Unfortunately from there we roll into chapters six and seven, both fully devoted to describing models and theories (and heaven forfend you confuse the two!) in excruciating detail while somehow never actually explicating the aforementioned model or theory through the use of an example that might illustrate what said critter looks like in the real world. Oddly, all the examples so desperately missing from this section show up in the chapter dedicated to listing types of methods of information gathering, which was full of samples of real-life instances of researchers who made use of case studies or interviews when it would have been better served with a closer examination of the pros and cons of each method.
This volume does come with a limited (read: far from complete) glossary, as well as an appendix of questions for discussion and application that would probably have been better split up and appended to the chapters they applied to. The most useful part for me, frankly, was the 73 pages (and that's in what looks like 10 pt type) of references, which at least provide an excellent jumping off point for additional reading and research.