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I don't think there are any hard numbers, but most "mainstream" titles are also available from other US ebook stores such as Books on Board and FictionWise. Amazon is probably a bit cheaper overall, but this can vary from book to book.
Amazon has more independent (e.g. published by the author) ebooks than anyone else. They also seem to have more non-fiction and technical ebooks, but my impression is that these titles would be available to other ebook stores if they thought there was a market in selling them.
The Kindle supports DRM-free MOBI, so in principle you are not tied to the Kindle store. However, Amazon has designed their device around the Kindle store and its delivery system. That is why the Kindle 2 does not support folders or a SD card. I don't see this as "evil", although I would like them to add ePub support to demonstrate that they are not abusing near monopoly power.
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