I recently found your project and it is very interesting but lack on documentation.
When trying it on my MacBook, I had a weird problem, not all the icons appears, I must "play" with the wheel to finaly make then appears.
here is a screenshot:
I also have questions about the radio. Is it only a XM radio player, or does it work with a FM radio tuner ?
Do you have plans to be able to connect and use a phone ?
And is there a GPS module that would interact or launch a GPS software planned?
I know, this is a lot of questions, but I find your project very promising.