Notwitstanding that David Pogue of The New York Times is famously an Apple enthusiast (and writes books about Apple products), his early reaction to the iPad captures the key point: it will live or die based on whether there is compelling content for it... The same way the iTunes Music Store made the iPod more than "just another music player" and the App Store made the iPhone more than "just another smartphone."
The Apple iPad: First Impressions - Pogue’s Posts Blog - NYTimes.com