I’ve been a fan of ISSUU for a pretty long time. Besides the fact it sounds like you are sneezing when you say their name it’s a pretty easy and relatively low cost option for embedding printed documents in your website and adding some interactivity. Sometimes you just have to present information exactly as it was laid out in a print layout program and ISSUU does this.
Sometimes all you need is just one page or a section of a page within a pretty large document to share with someone. ISSUU recently released that feature and I think it’s pretty useful! I recorded a little video that shows this.