Issuu is an online publishing house, where you can host your documents and read those submitted by others. It's full of magazines and PDFs uploaded by individuals and professional organizations alike.
Issuu's sign-up process is similar to other web apps in that you can search your contacts lists for friends already in the community and so on. If you want to read publications, simply search by subject to see what's around.
Issuu's magazine viewer is extremely smooth and attractive, with a variety of views available so you can read pages in a way that is most comfortable for you. Some publishers even enable downloading, so you can enjoy the PDF files at your leisure.
Uploading and sharing your own documents to Issuu is really simple, and make Issuu a great way sharing your stuff with others. The privacy options are simple but effective, and you get 100 MB, or 500 pages of storage space with the free account.
Issuu is a nicely designed web app that is both an excellent platform for publishing documents and a really slick document viewer.