If you have a Kindle 2, you can strip the DRM from its AZW ebooks using mobidedrm and Calibre can convert DRM-free AZW (MOBI) ebooks to LRF or ePub for a Sony. This is probably legal in the US providing it is only for personal use.
Amazon now has Kindle for PC, but so far the PID used on the PC is a secret and so mobidedrm won't work. So currently you need a Kindle 1/2/DX or an iPhone/touch to liberate AZW ebooks. Note that some Kindle ebooks are in the TOPAZ ebook format, and these are Kindle-only.
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