Following Lenovo's announcement that it will sell Linux-based notebooks, Dell says it will come out with consumer PCs that run Windows and Linux simultaneously. 

According to Reuters, virtualisation will allow users to run multiple versions of Windows and Linux at the sames time. Different versions of these operatiing sysetms could be run on a number of different virtual machines.
The new computers could be available by early 2008.
It's not yet sure whether they will come with different virtual machines pre-loaded, or simply with the ability to let users load their own.