On my PC (an MSI Micro-ATX P4 mainboard) I recently updated my BIOS - The software that came with the motherboard automatically detected that a new version of the BIOS was available, downloaded it, and I just had to click the "flash" button and reboot, all within Windows - no boot disks, no command line. I think most newer PC BIOS's have a similar feature, or will have soon.
