Curious. Does the Kindle sync (position/bookmark etc..) for side loaded books (those not purchased at Amazon)? Otherwise as Sameer pointed out the Kobo does the same thing across its apps which has worked pretty well for me (though I am personally on a Windows PC rather than a Mac, but do also use an iPhone).
Also Katia if you don't yet have a Kindle (hardware) and are looking at buying one, I would consider holding off a little as a next generation model is rumoured to be out very soon (Sept. seems to be the month being mentioned a lot). Anyway if you are interested you will probably find more info in the Kindle or News sub-forums.
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