New version available...
This one has multimedia key support (thank you Slice).
This one also has a high resolution trackpad fix for Synaptics (2400 dpi instead of 100 dpi).
The high resolution fix makes sure the pointer of the trackpad goes smooth and gives better control in the Apple Trackpad prefpane (thanks to ivik for suggesting this).
Also Tiger version is fixed... this one needs AppleACPIPS2Nub.kext though (should be standard present in /System/Library/Extensions/AppleACPIPlatform.kext/PlugIns).
Updated: Fixed minor issue with Synapics speed and only high resolution trackpad fix for Synaptics, not ALPS...