I haven't seen a genuine 3-button mouse since the mid-90s and although the mouse-wheel is clickable on every wheel mouse I've ever used, I don't find this useable. Yet I find myself using 3D modeling applications which seem to be designed by people who live in a world where 3-button mice are commonplace.
So I'm wondering if anyone knows where a mouse can be obtained that has a useable middle button (preferably in addition to the wheel). I know there are lots of multi-button mice, but they have the extra buttons all over the place except where I want them (i.e. between the left and right buttons).