It marks the first time publisher Penguin has targeted PDA users and also the first time Guardian Unlimited has hosted e-books. Penguin will be the site's exclusive advertiser for three months from 1 October.
Users will be able to access the first chapter of three of Penguin's latest e-books, including Zadie Smith's The Autograph Man, for free. A 'three for two' offer will run throughout November on the top 10 titles.
Users will also get a 20 per cent discount on Penguin's paperback Christmas books and will be able to enter a Christmas competition.