I'm using a cordless Logitech 3 button (2+ plus clickable scroll wheel) in Mac OSX, 9.2, 9.2 and SuSE Linux 7.1.
It works best in OS9, but OSX is decent -- scroll wheel works in IE 5.1.
I was a little surprised it was just ready to rock and roll in Linux with no extra work. Scroll wheel doesn't work in some browsers.
Generally happy with it especially since my 5-btn optical kensington crapped out on me.
and if you can find one that's optical AND cordless like Bluedog did, then so much the better, faster, and lighter.
[ 04-03-2002: Message edited by: vsurfer ]