You're right, it's not that hard. In fact the underlying technology for the TouchPad is the same as your multi-touch enabled smartphone. read more
Multitouch - Windows doesn't support multitouch to the extent that Mac OSX does (I personally think multitouch stuff on a touchpad is stupid, but hey thats a different topic). 2. Size - The algorithm MS uses to calculate mouse acceleration on Windows is far better than Apple's one. read more