Some book stores (ex: Fictionwise) even have a "Kindle format" on their multiformat list of ebook type choices. This works well, or even .mobi (non-DRM). All .pdf, .mobi, .prc, .txt and .html (rename as .txt) that I've purchased from anywhere work just fine on the Kindle. And .epub and .rtf file types can be converted very nicely to .mobi with Calibre (free and easy-to-use). Sometimes I convert pdf->rtf->mobi to get text reflow, but usually it doesn't matter to me.
Basically, all non-DRM types can be displayed with minor effort.
DRM (and Library ebooks?) would be an issue.
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