Well, as Murphy's Law would have it, I stumbled across the anwser within a few minutes of posting this. Apparently, the makeactive is what was throughing it for a loop. That, and I was going to the wrong hd#. My modified grub.conf looks like this:

title Windows XP Pro
map (hd0) (hd1)
map (hd1) (hd0)
root (hd1,1)
chainloader +1


Hopefully this will help someone else later on.

Travis

That looks like you're making hard work of it.

I have a similar setup, but in reverse; Linux is on my secondary disk.

My menu.lst is as follows (comments omitted):

default=0
timeout=10
splashimage=(hd1,0)/boot/grub/splash.xpm.gz
title Fedora Core (2.4.22-1.2149.nptlsmp)
        root (hd1,0)
        kernel /boot/vmlinuz-2.4.22-1.2149.nptlsmp ro root=LABEL=/ hdd=ide-scsi rhgb
        initrd /boot/initrd-2.4.22-1.2149.nptlsmp.img
title Windows XP Professional
        rootnoverify (hd0,1)
        chainloader +1

I should note that the only bit I've edited is the Windows XP part; I let the Fedora kernel packages take care of their bit.