We mash up indexes. You know, the indexes in the back of books. We mix them with indexes from other books. Then we throw in some indexes of blogs. They grow into these fun (and yet highly useful) tools for finding info.
And if you’ve ever thought it stinks to buy a book before really knowing what’s in it, you’ll like what’s we've done with the index to Seth Godin's Poke the Box: instead of just page numbers, you'll find the actual paragraphs of content that the index entries refer to. Because “Look Inside” or downloading chapter 1 just isn’t enough.