I was wondering how were you able to convince Broadcom to give you the datasheet for the SoC? I tried to obtain a datasheet from them for a different chip for a similar project but they refused.
Eben, the Foundation founder, Gert who designed the Gertboard, Dom and myself all work for Broadcom.
However, Eben is the one with the influence! He's also managed to get a decent discount on the chip (which would normally be reserved for very large purchases), and charitable status helps!
Note that the datasheet does not cover the GPU, which, if you were building your own product you would probably need. That's where NDA's and contracts are required and big sales numbers talk.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Please direct all questions to the forum, I do not do support via PM.