There are two issues with all this multi-core speak we've been hearing:
There is hardly any code, other than a few optimized libraries, that use multi core processors. They try to make it sound unimportant but it is the largest hurdle. There is a reason people don't think of a 3930k as being 50% faster than a 3820! Other than some failed libraries like OpenMP; there are no valid programming models to use either multithreading and/or networking transparantly (since it should not functionally make any difference). Ergo: The developers are still making their single-thread code.
The advantage of multi core processors can be that you can lower you clockspeeds and/or memory speeds on secondary tasks. Hardly any research is done on that (I have myself but let's call that an 'academic' proof of concept).