Document creation, collaboration and sharing with Microsoft
Document sharing with heavy emphasis on .PDF and digital versions of commercial hard copy books for sale. Extensive "private" collection requires uploading a file to the collection or paying an access fee.
Document sharing. Mixed bag, but could become something.
Document sharing with emphasis on public domain and creative commons licensing for wide variety of media types.
Slideshare for sharing documents with a heavy emphasis on presentations.
startups to watch
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