I think maybe as a more tech savvy person it's easy to forget how cool and easy this is to use for someone who isn't. Just because we have all this technology around us most people only want to go skin deep. They have no use for Disk Utility or Multi-tasking.
For example, my grandmother who is intimidated by a computer would probably sit on her couch and use this for hours to play Scrabble.
To little children, and grade schoolers who can't type a multi-touch interface is very intuitive because it is more of an analog to every day life.
Plus, you can't underestimate the tweens and teens who will be begging their parents for one of these INSTEAD of an iPod touch or Nintendo DS or PSP. The parents will reason that they can use it too, the kid can use it, the kid can play games, and if you attach a keyboard they have a little computer for schoolwork.
Children don't need windows 7, Ubuntu, or OS X on their computers and neither do the majority of adults who use the computer for light duty tasks.
Even many college students would be fine with this over a laptop. You can't underestimate the number of people who use the computer JUST for Facebook and light web browsing.
I have so many relatives who have dedicated computer rooms and giant monitors with over powered machines attached just so they can log on for 10 minutes in the evening to forward a chain letter with adorable cat photos. . The only thing missing is a camera so those same entry level users can post things to eBay or class project.
For a business person or someone in one on one sales they can share brochures or product info in full glory something that can't be done on the iPhone or Touch and impress the clients.
Let's not forget teachers, lecturers, medical professionals and many other applications where a small phone isn't large enough but carrying a laptop around like a platter isn't appealing either.
I think we need to wait and see on this. Its a good price for education and organizations with the option of all the time connectivity. I think the important thing to remember is the value of this to people who aren't like the users at macrumors.com (i.e. tech savvy).