An application such as Aabby PDF converter can covert a graphic PDF (one that is basically a photograph of a page) to reflowable text. I just got done doing exactly that.
I happen to love the way the Nook manages PDFs which are mainly text. As far as PDFs with many images, it is workable, but not wonderful - but is also as good as I've seen on a small screen. That is where the big format Kindle shines, as it does not have to resize or manipulate the content.
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