I have started a wiki entry describing the process I followed to get a custom firmware up and running using GCC. To ensure that it is accurate I will actually be reproducing all the steps as I write it, so for now there is only a draft outline.
The one piece of value that the entry does provide at this stage is the all important scatter file. If you are interested you can get the file I am using from the following location on the wiki.
We can add you as a developer and you can then touch the code directly. Interested?
Thanks for all the efforts.
@ taylorza - Good start!
That would be great, I would be very interested in being able to contribute in someway.
It is a pleasure! Thank you for making all of this available for us hobbyists.
I have committed the updated GCC scatter file to the GHI Codeplex repository. So the file on the wiki is no longer required, I will be removing that section.
I have also started to flesh out the rest of the sections leading up to the final goal of building and deploying the firmware.
We have a new open source hero.
Congrats taylorza 
@ Gus, @ EriSan500 (Eric) - Thank you.