I was just wondering if it's possible to use linuxbios as a kind of virtualisation machine, meaning that I could use linuxbios to snoop windows drivers for register hunting (to get real 3D-gfx-support for instance)? This means that windows would run as a virtual os.
Not really. LinuxBIOS is pretty much for booting live hardware. What I think you wan't is the bochs project, VMware or Win4lin.