If iPaper is new to you here are some tips on using it.
The icons at the top of the panel on the left are controls for paging forward and back, making text larger and smaller, seeing all pages at once, and more. You can hover your mouse on a control to see a tool tip on what it does, or of course just try it out .

An especially nice book-like feature works if you click your mouse once anywhere in the panel. After that you can use your keyboard's PageUp and PageDown buttons (or the spacebar) to turn pages.

Reading seems to look best if you choose full screen – that's the right-top icon on the panel.

You can read about the SCRIBD product iPaper itself (and use it for your own documents) at http://www.scribd.com/ipaper