This does not mean that they're goign to piss off all the manufacturers by building their own machines. What it means is that in order to be allowed to run a Windows licence the hardware manufacturer is goign to have to demonstrate that it's capable of doing so and the components used are certified by MS and of a high enough standard.
In other words, no more 'Vista ready' scandal.
In other words, "Vista Ready - For Real This Time! No, Really, We Mean It Now!"
Which also probably means the end of bargain-basement $299 PC's.