You can add pages without visiting them, too. If you're reading a page on one topic and want to include the page written about a certain link on that page, hover over the link until the add page button appears. You can add whole categories in similar fashion. Book prices vary depending on the number of pages, and start at $8.90 for a paperback; hardcover books will be offered soon.
I don't think that I'll be making a printed book any time soon, though this could be a fun gift for a history buff, band or celebrity superfan, or just a kooky keepsake for a friend with an eclectic interest. For a cool video tutorial on creating your own, visit the PediaPress site.