Here’s a video of me going through the entire process of installing Android onto my iPhone using only my Mac using my instructions from here.  The only difference is the way I’ve killed iTunes and the iTunesHelper (using Terminal).

Before starting my iPhone was jailbroken using sn0wbreeze (on Windows 7) with firmware 3.1.3  I have also tried with 3.1.2 using PwnageTool and that also worked perfectly for me.

Here’s the video (you’ll probably need to view in fullscreen):