I liked the idea of a separate, electronic format for several reasons:

• Those who don't buy the book can still have the assistance of a practical guide (though hopefully most would buy the book...)
• I see the two as serving different purposes. While I don't know what Eliezer's format/content will be, perhaps the book could be viewed as sort of reference "textbook" for education, with the workbook serving as a guide to actually apply such information to your own life (just learned about bias x? Great, here's how to identify it in your life)
• Lastly, I like an electronic format simply for the accessibility of it (have internet? Super -- download it and continue where you left off) as well as the ease of updating. One great usefulness of updates could be to make various versions with different problem sets -- once you run out, the next edition will replenish your supply.