To use Metro-style applications, the Windows 8 Consumer Preview requires a minimum resolution of at least 1024×768. Unfortunately, most netbook displays are limited to 1024×600 – an unfortunate limitation of Intel’s GMA 3150.
To get around the chipset’s cruddy native resolution, you can enable downscaling of higher resolutions by enabling Display1_DownScalingSupported in the registry. I’ve exported the appropriate key for anyone interested: just download, double-click to import, and reboot your PC.
Note that downscaling will (obviously) create some blurry-ness, as Windows is doing it’s best to emulate a larger image on what is physically less pixels.