Issuu describes itself as “free online publishing service and a creative community dedicated to publishing”. In simpler terms, it’s a document sharing community with a focus on creatives. The best thing about it, is its web-based PDF viewer that makes online document viewing/reading much more interactive. Photographers can use it to show off their portfolios, regular folks for more interactive eBook reading experience and so on.
Features
Check out Issuu @ www.issuu.com
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We have posted one of our four color how-to books to issuu, we really like the format. Our Yoga book is located here: http://www.maran.com/onlineyoga.html
I prefer Samuraj Data when I’m in rush to view a PDF from a URL and not local file. An advanced version is PDFEscape.com with more features. But the output is an image which means links are not click-able.
For click-able links I think PDFMeNot.com is currently the best out there. 
I dislike it because it requires Flash - but the links are click-able because of Flash technology I guess… ? 
[...] As you can see above, it’s clean and simple. On the other hand, it still lacks some of the basic features like the ability to grab the embed code directly from the viewer, option to download the document in different formats and commenting. If you need such features then you might want to check out previously covered Scribd, Edocr or Issuu. [...]