I literallly just discovered today Calibre which is "a free and open source e-book library management application developed by users of e-books for users of e-books." I bought a B&N Nook a few months back and have been getting most of my ebooks from Project Gutenberg, manybooks.net, etc and have been frustrated with incorrect/lacking metadata, or finding ebooks elsewhere in formats I couldn't readily put on the Nook. This software seems pretty damn slick, especially with fetching metadata from Google Books or isbndb.com (didn't even know they existed before!) and it can convert damn near any format to anything. So until we do get a universal ebook format, perhaps people can check out Calibre.