Jabarkan AMD's "Enhanced Virus Protection" dari AMD64

Intel tweaks EM64T for full AMD64 compatibility

Early report of differences between Intel IA32e and AMD64

Porting to 64-bit GNU/Linux Systems, by Andreas Jaeger from GCC Summit 2003  . An excellent paper explaining almost all practical aspects for a transition from 32-bit to 64-bit.

Tech Report article: 64-bit computing in theory and practice