How to Reverse the mouse scroll wheel - to match Apples OSX 10.7 (Lion) "Natural scrolling"
From Tech-Wiki
1) Find the hardware ID of the mouse
Go to the mouse control panel
Select “Hardware” tab
Click “Properties” button
Select “Details” tab
From the drop-down list choose “Hardware IDs”
Save the VID*** entry ( e.g. VID_045E&PID_0039 )
2) Find and change the corresponding configuration settings in the registry
Run regedit.exe
Open Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\HID
Here you should find an entry for the hardware ID of your mouse
In all sub-keys of the hardware id key look for the “DeviceParameters” key and change the “FlipFlopWheel” value from 0 to 1
3) Make it work
Unplug the mouse
Count to five
Plug the mouse back in