If you have a Kindle and these books can be read on the Kindle then they are obviously drm'd with your Kindle PID. You have several solutions to authorize them for your iPhone. The easiest, in my mind is to obtain your PID with a python script called KindlePID and then add the PID along with the mobidedrm script to Calibre. I like Stanza on my iTouch to read my ebooks and set it up to share my Calibre library via wifi. You should find detailed directions for these solutions here on this website
I believe that you can also use ibook with Calibre and transfer ebooks via iTunes.
cheers
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