Wow, so with Mantano available via Amazon's app store this must be the first device released by a major bookstore player that offers both MOBI and ePub without jailbreaking or using some kluge methods. Just straight forward good rendering of both formats. The Kobo Touch had MOBI support but it rendered it looking like a DOS text file, yuk! Way to go Amazon. (Note that Apple has both on the iPad but Apple isn't a major bookstore player IMO.)