Tip of the day - wheel emulation

[update 30 May 2012: add xorg.conf.d snippet] First, run xinput --list --short to identify your mouse device. Let's assume that your mouse is called "USB Mouse".
Then, run the following command:

xinput --set-int-prop "USB Mouse" "Evdev Wheel Emulation" 8 1 
xinput --set-int-prop "USB Mouse" "Evdev Wheel Emulation Button" 8 3

Now, holding the right mouse button and moving up and down will scroll. Very useful for reading long articles.

Requirements: evdev 2.1, X server 1.6 and xinput 1.4. Don't forget to check the evdev man page, there's a few extra tweaks related to wheel emulation. xinput is not persistent, but the above can be achieved with the following xorg.conf.d snippet:

Section "InputClass"
   Identifier     "Wheel Emulation"
   MatchIsPointer "on"
   MatchProduct   "USB Mouse"
   Option         "EmulateWheelButton" "3"
   Option         "EmulateWheel" "on"
EndSection

Save this as /etc/X11/xorg.conf.d/99-wheel-emulation.conf and you're good to go. Requires X Server 1.8 or later, for older servers you can do the same by merging the keys input.x11_options.EmulateWheel and input.x11_options.EmulateWheelButton your HAL fdi file.