About This File
I took a VoodooPS2Controller.kext modified by Andy Vandijck and an ApplePS2Controller.kext modified by Slice and combined them to make two-finger scrolling a reality on the Inspiron 1520/1720. Install to S/L/E along with the AppleACPIPS2nub.kext. Use the Apple Trackpad prefpane attached to adjust the settings. Install to /
EDIT: I updated the ApplePS2Controller.kext to include an ApplePS2Keyboard.kext that runs in 64-bit mode. The previous version of the keyboard plugin only ran in 32-bit mode.
EDIT: I successfully got this to run in Lion DP4 on my Dell Inspiron 1720.
EDIT: It does not appear that the prefpane works in Lion. I'll see if I can find one that will.