Mapping Websites: Digital Media Design looks like an interesting book, although I really can't be sure because I only saw it for 2 minutes in the bookstore the other day. Perhaps not the most useful book for working Web folk, but it's filled with different schemes and techniques for mapping out information on the Web...and lots of maps. Mmmm...maps. (see also: Web Cartography)
BTW, I've added a bunch of books and movies and such to my Amazon wishlist, stuff that looks interesting to me but hasn't been mentioned here for various reasons. I tell you this not because I want you to purchase these things for me, but because you may find them interesting as well.