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As noted by TUAW, Amazon has released the a Mac software application to read Kindle books under Mac OS X.
"Kindle for Mac is the perfect companion application for customers who own a Kindle or Kindle DX," said Jay Marine, director, Amazon Kindle. "For those customers around the world who don't yet have a Kindle, Kindle for Mac is a great way to instantly access and read the most popular new releases as well as their old favorites."
Kindle for Mac is a free download that allows Mac users to access Kindle-based eBooks even if you don't own a Kindle. For existing Kindle owners, the Mac application will sync bookmarks and annotations over the air.
Amazon had been said to be working on this Kindle for Mac application since October of last year.