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Here I've uploaded David Gewirtz's "How to Save Jobs" in EPUB format through the Ibis reader website, and reading it on the iPad.
Lexcycle Stanza is the most mature and sophisticated eBook reader application for iOS. Originally developed for iPhone, the product was purchased by Amazon in 2009.
Stanza allows you to purchase EPUB and MOBI format books from several sources and also allows you to import your own EPUB and other file format content thru iTunes or via the Open Source Calibre Content Server application.