Personally I think the best textbook on logic design is AMD PAL Device Handbook. All my logic training was based on the book, read by myself, not taught at any classes.
I bought 5 VHDL books, but only the AMD book really teaches me how to program in logic.
The open CPU source code is an excellent contributions to the generations of logic designers by Sun Microsystem.
It would be much wonderful If there is an retired engineer from Sun who deeply invovled in the code making writes a book with the opened source code. It would be more valuable than any Verilog books available in the market.
Teaching by example is the best way to teach a language and related technique.
Real design examples give you really deep insights on what the designers were thinking about and how nicely they handle the difficult situations.
I appreciate Sun's efforts to open its source code.
Thank you, Sun Microsystem.