Oooo...good catch JennyB!
I've been a big fan of A Pattern Language
since farther back than I'd sometimes like to admit. This is one of those subtle and deep books that can be broadly applied to a number of design issues, be they hardware, software, or wetware
Amazing how some of the best books about
computers aren't about computers
Another recommendation: Understanding Comics: The Invisible Art
by Scott McCloud.
Although ostensibly about design and presentation strategies in the creation of comic strips and graphic novels, it delves very deeply into how the brain processes text and visual information in order to make connections and assign meanings.
This is probably one of the best books on web design
and data presentation out there. (Even if it isn't strictly about either.
Note: in the fine geek tradition of "eating your own dog food" Scott's book is written in comic book format. Far from being a gimmick, it actually allows the book to serve as example of all the examples in the book.