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If you're still looking for an answer to this, here's a nice guide on how to read Kindle books on your iPad:
From an earlier post on this subject: Just use the free app from Amazon, don't pay money and get ripped off needlessly.
Why wouldn't you just use the FREE Kindle for iPad app? You can get it direct from Amazon, so you at least have some confidence in the publisher. I don't know anything about Epubsoft, other than it costs $45.99 to purchase according to cnet. True, there is a 30 day free trial, but $45.99 to read ebooks on an iPad when you could do it for free with Amazon's own app.....I don't really have to think about that decision.