Like I said, comfort zones. You are accustomed to things you're doing and routines association with their respective devices. As for how many, those I've listed represent how many. Diverse too. The company I'm working is looking into the possibility of using the iPad as the electronic flight bag and content delivery system for our operation. Also for customer interface unit, as well as the staff's allocation for flight operation purposes. I've had tons of requests to get folks their VGA kit, and guess what they're using it for? Presentation on the iWorks suite. Others use VPN and VNC service to access files remotely from where they are to assist them in their work while they're away from head office. Doctors using iPads for remote display. DJs using the Korg Electribe for music mixing. Their sales numbers are not indicative of "casual usage", especially when it comes to professional-level apps like Foreflight for pilots, iWorks, the Anatomy app, LogMein Ignition or the Korg Electribe, because these apps are not priced casually, they are priced targeted at working professionals.
Just because you treat it as a toy, doesn't mean that you represent the total demographics. The iPad is flexible enough to function based on what the end user wants it to be. Just like how some folks buy their iPhones to "just make phone calls , text messages, and occasional Sudoku games", others actually use their iPhones towards more serious productive ways.
So please, before you conveniently label this as a "toy", try broadening your horizon and meet more folks and ask them what their iPad usage are like.

Just a friendly advice.
Added on August 16, 2010, 9:38 pmThe only weak part I see on the iPad is content
creation. As a content delivery or consuming device, it's processing power , size advantage and screen estate is godsend.
it's still consider as toy to the majority. iWorks suite ? look pretty limiting from the review on apple site itself. Most with Macbook would not even wanna use that.