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Re:NYT Skimmer by abraham on Tuesday July 26, 2011 @12:38PM (#2808161)
They are almost the same thing. They perform the same function but because they are physical invisible they are even less likely to be used by an average computer user.
Re:NYT Skimmer by jergason on Tuesday July 26, 2011 @02:54PM (#2808903)
I have some anecdotal evidence on the contrary. My wife is a very casual computer user, but uses two-finger scroll all the time. My sister-in-law is very similar - not a computer person, but has an Apple laptop and uses two-finger scroll. Also, Apple mice support scrolling[1], and almost any third-party mouse you buy will have a scroll button as well. Scrolling with a mouse or trackpad seems like an integral part of user interaction.

[1] http://store.apple.com/us/product/MB829LL/A?fnode=MTY1NDA1Mg...