Determining if GRUB is the bootloader in use on a system

[Jeremy Katz]

As may or may not have been noticed, we are giving GRUB as the primary
boot loader in the Red Hat Linux public beta released the end of last
week.  Unfortunately, due to the vagueries of hardware just being weird
and lack of the kind of widespread use that LILO has seen, LILO is still
offered as an option during the installation process.  The difficult
problem is being able to tell post-install whether GRUB or LILO is the
bootloader being used as GRUB does not overwrite the area of the BPB
where LILO writes its magic identifier.  Am I just being blind and
missing the easy way to check and tell if GRUB is being used as the boot
loader?  

If not, what would people think of checking during first stage
installation to see if the LILO magic is present, and if so, overwrite
it (using GRUB seems sort of fitting, but just zero'ing it out has
merits as well)?

Thanks,

Jeremy