iWork is TERRIBLE when working with anything but the most basic Office documents, and while other apps are better none of them are good enough to rely on. Since pretty much everyone uses Office to create work related documents it's kind of a big deal. The iPad has a fisher price file system(I still can't figure out what kind of a moron greenlit that idea, but whatever) that requires you to duplicate the same document over, and over and over if god forbid you want to use multiple apps to work with it, and there is no easy way to share the same document between apps without connecting the iPad to iTunes, which defeats the whole portability argument. While, iPad IS fun attempting to compose anything besides a short email using the virtual keyboard is NOT fun and if you have to bring a keyboard along with the iPad you might as well just get a laptop/netbook. There are a myriad of other reasons why the iPad sucks for productivity, which I don't have time to list.