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When the first edition of this book was published, we couldn't have included this appendix; there were few (if any) books, sites, and communities dedicated to information architecture. Now there are far too many to include them all.
And by the time this book finds its way into your hands, some of these resources will have been superseded by better competitors, some will have gone the way of all flesh, and some will have morphed into entirely different resources. URLs will change too, but enough excuses. This is a reasonable snapshot of what we feel are the most essential information architecture resources as of summer 2002.