On OS X 10.7.5 with a Nexus S running Android 4.1.2 I get the following in kernel.log:

    11/15/12 9:55:40.019 AM com.apple.kextd: Can't load /System/Library/Extensions/HoRNDIS.kext - no code for running kernel's architecture. 
    11/15/12 9:55:40.022 AM com.apple.kextd: Load com.joshuawise.kexts.HoRNDIS failed; removing personalities from kernel.

Great project, btw. Can't wait to try it on another phone/computer and get it working.