Linux desktop
It is the preinstall for the masses, it is that simple.
MS made sure the market for OS selection was made by the OEM or Retailer not the consumer.
That may change, but not before MS is knocked off the preinstall pedestal.
MS should be selling like other software houses, ie a product on the side, that the consumer decides to put on their machine.
That would then allow consumers the choice in operating system, and for companies such as Xandros, Linspire, Progency, Redhat, Suse, Mandrake, to sell their operating system as well.
Ubuntu has had to go down the support line, but I imagine they would be happy to offer an OS at the checkout.
But, that has been tried and it will continue to fail until the preinstall OS market is varied enough, to allow the consumer the ability to make a choice.