Anyone who doesn't believe that the iPad is competing in the e-reader space needs to read this, which is being reported by several outlets. Amazon removed all MacMillan material in a dispute about pricing--that is, the higher pricing for the iPad. This is the Fort Sumter of the e-reading wars, my friends.
http://www.engadget.com/2010/01/30/macmillan-books-gone-from-amazon-com-steve-jobs-grins-wryly-fro/
http://www.engadget.com/2010/01/30/macmillan-books-gone-from-amazon-com-steve-jobs-grins-wryly-fro/