Intel has introduced signigicant changes in its architecture this time, moving from the NetBurst to the Core architecture. There are also other features like Vanderpool or Intel VT-X that supports unmodified operating systems to run on a host operating system by hooking into a Virtual Machine Monitor(VMM) running on the host.
There is a lot to catch up with, but the PDFs are a pain to read while sitting on the system. So, I ordered printed manuals from Intel. They sincerely sent it by international priority delivery. All for free. Thanks Intel!