You can now buy Kindle ebooks if you are in the US and have an iPhone or iPod Touch. However, they are downloaded directly to the iPhone. It is possible to get the ebooks off the iPhone and then (if they are AZW files) they can be stripped of their DRM using mobidedrm. Finally Calibre can convert DRM-free MOBI (AZW) to LRF or ePub. Stripping DRM from ebooks is generally thought to be illegal in the US, although it is hard to see who is hurt by format shifting for personal use ebooks you bought.
The Kindle Store does have the largest number of ebooks for sale in one place, but many of them are available at other stores. Some of the Kindle-only ebooks are in the TOPAZ format, which isn't currently convertible to any other format.
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