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Originally Posted by Jasonofindy
Amazon.com- The books from their store are essentially mobi format with a proprietary DRM. Books purchased from them will only work on the Kindle and the various devices that now have software "Kindle Apps."
EDIT: starrigger notes that "[A]uthors direct-publishing to Amazon and B&N have the option to make their books DRM-free, and many do." ATDrake adds, "[T]he way to tell if an Amazon book is DRM-free is to look for "Simultaneous Device Usage: Unlimited" in the Product Details on the book's description page. If it has a number listed or omits that field entirely, then it's DRM."
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As of April 2009, the DRM-Free option is also given to other publishers as well - no longer just to authors publishing through Amazon.
e.g., Baen and O'Reilly sell DRM-Free books on Amazon.