I'm wondering if Mac will really be able to beat a "normal" PC system in the future. As we currently stand I read a test review comparing an Imac and a Compaq PC equipped with a 700 MHz P3, IBM Deskstar HD, 128 MB RAM and a Geforce 256 DDR card. The PC beat the Imac on all points except on design.
I must admit though that I have not seen the specs on a G5, nor have I seen any previews.
The point is that Macintosh inc. has made a strong point for a long time that a Mac is faster and better than a PC while their hardware (HD, Processor, gfx card etc.) is slower than a PC equivalent in the same price range.
As I see it Mac is a nish product mostly used by media companies (such as publishers etc, due mostly to historical reasons).