I've heard of such issues a few times, the download works fine but the file is corrupted. It can be on our end but usually, it's a network issue and simply deleting and downloading the book again should work. If it doesn't, you can always send me an e-mail and I'll check everything.
@Leep: we don't link to the files directly in the RSS feed but maybe we should now that we can turn RSS feeds into files for the Kindle. This way you could for example download the feed for the latest SciFi books and download the books directly from this file. Like a custom download guide...
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