Well, whatever speed differences you see are most likely going to be software-related. But even then, the noticible difference will most likely be nil. (With the exception of really low amounts of RAM; OS X isn't happy at 256MB and below - but you won't see shipping intel Macs with that little RAM.) The "real" Mac selling points will likely stay the same: good design, good interface, high quality, and good stability. I personally believe that Intel's economies of scale means that even the PowerMacs (or whatever they call them) will be more price-competitive. It's very possible that the new intel Macs will be the first Mac I buy. (Hell, the first PC period from an OEM.) Chances are looking very good that Macs will accept Windows installation with little or no problems; combine that with intel's new tech that let's you run multiple OSes simultaneously, and you're looking at a fun new toy.