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While it's not a touch screen, the track pads on MacBook Pros and the Magic TrackPad for desktops provide many of the touch gestures found on touch devices. So, touch screens? Maybe zero. Touch enabled? Plenty!

And, to be honest, touch gestures in general are a very welcomed change to the OS. I find the use of a mouse only needed for precision control (say, graphical work or gaming!)

Yep - in fact, I switched from a Mac Pro to a MacBook Pro largely because there was no way, at the time, to get a multitouch trackpad. I love the gestures.

And what percentage of Lion users have multi-touch trackpads that allow the same gestures?

Probably around 90.

But I'd wager that most Lion users have a pointing device that enables easy scrolling: a trackpad, magic mouse, magic trackpad, or a mouse with a scroll wheel.