[sillywalk]

I'm not sure if it's quite what you're looking for, but Inside the Machine by Jon "Hannibal" Stokes of Ars Technica has a good overview of computer architecture in general, plus detailed looks at some different processors.

From the Introduction:

"Inside the Machine is an introduction to computers that is intended to fill the gap that exists between classic but more challenging introductions to computer architecture, like John L. Hennessy’s and David A. Patterson’s popular textbooks, and the growing mass of works that are simply too basic for motivated non-specialist readers. Readers with some experience using computers and with even the most minimal scripting or programming experience should finish Inside the Machine with a thorough and advanced understanding of the high-level organization of modern computers. Should they so choose, such readers would then be well equipped to tackle more advanced works like the aforementioned classics, either on their own or as part of formal curriculum."