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If you have an apple laptop running OS X check out uControl. This will install a new pane in your system preference window (apple menu -> system preferences...) In that pane click on 'scrolling' and then check 'scroll wheel emulation'. Now when you hold down the function key you can use the trackpad like a scroll wheel.
No obvious problems in a few minutes of use. Excellent. This was bugging me. Surfing on the laptop will be much better now.
I haven't experimented, but this will also let you remap lots of different keys. Could be useful for desktop users as well.