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I think the Evoluent mouse gets recommended by Acme users.

http://www.evoluent.com/

http://www.amazon.com/Evoluent-Vertical-Mouse-Right-Handed/d...

http://russ.cox.usesthis.com -- `rsc`, do you still use this setup?

Yes, that's still my mouse of choice. On a Mac you need a 3rd-party tool like 'USB Overdrive' to remap the buttons correctly. On Linux you can use xmodmap.

You can click the scroll wheel, although I find that causes hand pain for me. Another option would be http://www.amazon.com/IBM-3-Button-Scrollpoint-Optical-Mouse... but in my opinion the scrollpoint kinda sucks.

The scroll wheel can be clicked as a middle mouse button on most mice.

That's true, but it's very awkward. In Acme, the middle button means 'execute command'. You need to press it constantly, often in combination with other buttons. A clickable scroll wheel is not good enough.

Maybe a mouse with touch scroll