I think touch screens are good as a portable sort of goods, but anything bigger then it is a bit pointless.
I guess this sort of item is meant to be replacing laptops? People use keyboards more than you think so I don't think it's a good idea, imagine trying to write out a word document using a hard touch screen, not fun!
My friend has a Archos 9 which is a similar sort of thing, it's a pretty awesome thing to play with but not something you'd want to replace a laptop, the Archos is a lot cheaper too (Not apple branded
). Nice idea I just think they're a bit unnecessary.
When you can get the Point of View Mobii netbooks for about £240 which have a HDMI out and 512mb dedicated Nvidia Ion card I think I know which I'd prefer for everyday sort of use!
If you're loaded n bored though go for it but in my opinion keep touch screen to the portable goods
