First off, these are Intel's CPU names. What core 2 duo means: 2 CPUs in one chip core 2 quad: 2 CPUs + 2 CPUs in one chip (not the same as having 4 CPUs in one chip) The more CPUs, the better. However that is if software is programmed to use multipl...
Centrino is a specially made technology for laptops, which means it will have similar performance to its non-Centrino counterparts while running at a lower voltage, with less heat and noise, and all-in-all in a smaller package.
It sounds like one of the new Intel Core Duo CPUs. This is a single CPU unit, that actually has 2 processing cores in it. To the operating system, it works and looks like 2 CPUs. It is also possible to build a system with 2 separate CPUs, which is wh...