[chris100]

A touchscreen PC with no keyboard is extremely limited

I don't know about you, but when I browse the web, I actually don't type that much.

Mike Arrington was specifically referring to the need to browse the web from his couch. In browsing mode, you like to explore and click. Type? Not so much.

And intensive use of my iPhone has shown me that the screen is just a bit too small to seriously browse the web for more than 10 minutes at a time.

So yes, there might be a market there.

[blehn]

Sure, while browsing the web, you explore and click most of the time, but there are plenty of instances when you need to type: a query into google or a url into the address bar, logging in to websites, commenting on a blog post, responding to an email. These things will have people reaching for their laptops in no time. Even if these are specifically for browsing the web from the couch, why not just use a laptop? They even have built in stands (the keyboard) so that your arms don't get tired holding them up.

Also, I'd imagine that typing on a touchscreen tablet PC is considerably more cumbersome than on an iPhone, since you'd only have one hand available.