Acer Aspire One modded into touchscreen UMPC
A ToDo forum member has crafted himself a rather lovely UMPC tablet by gutting an Acer Aspire One of its keyboard and trackpad, installing Ubuntu Netbook Remix on it, flipping the screen around and inserting a touchscreen panel. Thanks to Ubuntu's built-in touchscreen support, it apparently works a treat.
When are manufacturers going to start doing this themselves, extending the netbook concept to tablets? It's past time: in an ocean of indistinguishable netbook clones, the first netbook tablet would really stand out.
UMPC Tablet Acer Aspire One [ToDo Forums via Slashgear]

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The main problem the netbook tablet concept has, is that microsoft has prohibited the use of windows XP for that type of concepts.
Of course for people like you and me, that doesn't have a problem with Ubuntu doesn't matter much, but companies will target the biggest demographic :(
Then the problem gets solved when Windows 7 comes out. Already runs fine on existing netbooks, and has a bunch of touch features. See the demos from PDC 2008.