Just trying to sort out some things in my mind. What is the difference between/among the "Dual-Core", "Core 2", and ???? Some of these newer machines? It looks like some of them are the same with different names, and some are 1/2 the speed while others seem to indicate they are double the speed, etc.. Sorry, I haven't been able to keep up with all these changes. If you can give me a 2-bit tour answer that's fine. Thanks, van