If you haven't read "Masters of Doom" then that's probably the next step -- but I do consider "Doom Guy" better, in the sense that John Romero gave a much fuller description of ID's early years -- I think it matters more for Indies these days than the later years (post-Quake).

I'm looking for some books describing the process of Console hardware development -- e.g. why did the team decide to pick this chip, why the architecture, etc. Does anyone have any idea?