Do you want to touch the screen?
flipbrad: I'd rather not touch my screen but I do want multitouch controlling of onscreen objects, e.g. in games or graphics apps, or for sorting through photos, organising research snippets/post it notes (digital ones of course), moving icons around, etc.My proposed solution is this: a flat digital touch-sensitive keyboard (I know, some people like tactile feedback!) that can switch to a touch 'screen' mode with the flick of a switch - and though contact is required to manipulate objects, it senses hand positions without contact so that cursors are displayed onscreen where each fingertip is about to contact (so you can hover + seek, then click/drag)---------
alternative idea: multitouch phones used as bluetooth (multi)touchpads for your PC