The only one I've really used has been Microsoft Reader, which seems to be decent. I don't particulary care for the way it manages it's library, but I don't really use that feature anyway. I also had some wierd problems with it not being able to locate it's library directory if any changes were made to that folder's attributes which would cause the Reader to be unable to start. Had reinstall it several times.
I'd be interested in checking out a few third party applications.
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