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Amazon will not release figures so there are none to be had. But most of the speculation is that Amazon controls the US market and potentially controls the English Language market.
One of the common complaint is that Amazon does not use EPub but, as Nate points out, there was no EPub when the Kindle was released. While it is possible that Amazon refused to share its format with other e-readers, driving them to EPub, it is also true that most of the major EPub booksellers tack on their own DRM or make some subtle changes to the EPub so that it is harder to read their books on other devices.
I am not sure if BN books can be easily read on a Kobo or Sony now, I know for a long time they couldn't. I have read that Kobo has its own special varient on EPub which is a bit of a pain in the wazoo.
It sounds to me that EPub is a lot like Android. It has great potential but everyone who wants to make money forks it making the overall operating system a pain in the butt for programmers to work with. Which leaves programmers loving working with Apple because it is one operating system. Closed but well mantained and you don't have to write 8 different varients of one program to sell in the Apple store.
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