At All things D more details about the upcoming (!) Windows with multi-touch was revealed. A lot of the features might seem nothing on a Desktop and Laptop but sure will be handy in UMPCs.
UPDATE: Looks like the SDK for multi-touch in Windows 7 will be ready by October — more deets here
Microsoft demonstrates Multi-touch [Vista Blog]
Personally I’ll hold off until someone ships an umpc with the ubuntu netbook remix. that looks more promising and useful for a umpc