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I've put a few PDFs of presentation slides on scribd, and then used their widget to embed those slides directly into a blog post talking about the presentation. Linking to a PDF on another page (and asking many people to a) open acrobat, b) download a multi-MB file from my host) and/or hosting that PDF yourself is sub-optimal. Let scribd host it (you can provide a link to download the actual content you uploaded, rather than their web widget), and pay for the bandwidth. I never saw the use for it, until I started giving talks and wanting to embed them. It's youtube for PPT :)