I just installed Slackware 10 on a older 500mhz Compaq. Had the usual "mouse's scrollwhele doesn't work" problem. But when I go to add the "ZAxisMapping" line to xorg.conf, and logout, when I try to "startx" again, I get an error that says something about having the word "mouse" in xorg.conf.
Sorry I don't have the whole error written down. I'll try to get it here shortly. But if you have any idea how to fix this without seeing the whole error message, please comment away.