That kind of thing needn't be confined to PCs: You might order a book made up of six chapters on Russian stamps from six different books, or a CD with 12 tracks you specify, or a pair of pants cut to your measurements.

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When you read a book you don't have a number of optional pathways through the chapters.

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Each of the book's chapters is written by a locally based specialist (the authors include auctioneers, academics, consultants and dealers) who examines a country or region's art market history in terms of taste, fashion, value, art types, subjects, sales prices and records.

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There is a flow to the chapters in WTF, but many parts of the book can be read as independent concepts.

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When it came time to launch his book, The Purpose Driven Life, last year, Warren used Pastors.com to invite churches to participate in a "40 Days of Purpose" event (to correspond with the book's 40 chapters).

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