Blauboad - Whether or not Centrino is selling well probably depends on what you mean by "well." If Intel keeps the price premium on it, then that probably means that sell-through is very good. (Though when AMD manages to keep a premium on its high-speed chips, that can only mean yields are bad :)
It's all about balancing production capability with market forces, right? To assume that Intel and AMD price the same way is to assume their products are subject to the same capability/forces. They aren't IMHO. AMD has a few enthusiasts who will pay a premium price. At the same time AMD has real difficulty producing premium products so they need to control demand. Intel may not have the same restrictions.