yeah, nice that apple has to use dual core to even keep up with intels single core offerings. When intel has dual cores working at faster clock rates, they are gonna spank the G5's, which still aren't at 3 ghz even, are they. And that's probably what apple will be using. You should also note that apple probably won't be using the pentium D derived chips, but rather than pentium M derived chips that are coming. Do you really believe that the G5's are as fast as intel's. Apple hasn't been faster than intel stuff in like 10 years. Certainly not at a comparable cost or with comparable chips.
You should buy apple stuff for OS X and good hardware integration. Buying them for pure power is ridiculous in most cases.
Edit: You are right though, apple is all about marketing. that's how they've convinced people their computers are as fast as intels stuff for so long. It just hasn't been true.