OpenSource Hardware... Textbook and course
If you think OpenSource Software is interesting and good... check out the OpenSource Hardware!
There's a whole 'nother community out there called the OpenSPARC community and Sun just published our T2 core documentation out there. How neat is that? 
You can actually run a T2 core on an FGPA!
Along with the documentation for the T2 core and the T2 core on FGPA, a new book titled, OpenSPARC Internals, is now available for FREE. You can download the PDF yourself.
