Dave Winer isn't keen on the iPad, and points out a number of short-comings in the platform that I agree with, though his overall bent is negative compared to mine. This last point, however, pretty much nails the upside: the importance of the iPad, and the iPad platform, comes as a function of how savvy developers will implement their game-changing ideas on iPad and the iPhone.
It's fun to play with new toys, I do lots of that and it's important to me. No sarcasm. But reading a book that changes my perspective, or meeting someone who opens a door for me, that really does change the game -- much more than using a new device. If you're looking for game-changers look into yourself, that's where change comes from.