About This File
1, First backup & remove your trackpad kexts and /S/L/P/trackpad.prefPane.
2, Extract the ALPS zip file and use Kext wizard to install. Use the attachment trackpad.prefPane to replace the /S/L/P/trackpad.prefPane.
I am in the 32bit Lion, and the Trackpad.prefPane is running in the 64bit, so when you open it to set, it will launch twice. But it is only one i find from http://www.kexts.com/downloads.php?do=file&id=1448 for Lion and works well by far.