Apple started it, and Microsoft followed. Now Logitech is getting on board with a touch mouse, the M600. No buttons, just a single touch surface.

http://techreport.com/discussions.x/22443
http://www.logitech.com/en-us/mice-pointers/mice/devices/9480

Install the software and you'll have smooth scrolling.

Sadly Logitech's webpage says nothing about how left and right click actions work, which is by far my biggest concern. I don't want the mouse to just click every time I rest my hand on it. From the comments, someone said the Apple Magic Mouse does seem to require pressure to click, so just putting the finger on the mouse doesn't initiate a click.

I think it's really cool and might get one after I see some reviews and confirm unintentional clicks aren't an issue.