For those who like ebooks, Calibre is a great program that was created to manage pretty much any aspect of your reading files.
The list of features is pretty extensive:
convert files from and to epub, mobi, LRF and supports input of several other formats including PDF, html, odt, rtf amongst others; syncs to mobile reader devices (seems to work well with the iPhone/Stanza and the Kindle); convert a news feed to an ebook; scans your computer to check for all supported ebook formats so you can keep them organized, download cover art and meta data; runs on Windows, Linux and MacOS X.
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