Sweet, found a walk through made by CTscott over on YarisWorld.
YouTube Video of the Push Button Installed
Head on over to my My Google Site where a copy of the installation instructions are hosted. You can also find them here.
Here is a link to the best price I could find on the OEM Push Button Start (Toyota Part 89611-07010) in the US. $50.97 isn't a bad price considering that most places want $230+
I can' wait to get started on this mod although it looks like from the video that the way this is wired it completely disables the normal key start method. I'd like to have it both ways ;)
Which shouldn't be too much of an issue to do. Just split the wires instead of moving them to the new button.
Edit:
Almost forgot to include a picture for you all!