http://freebsdwiki.org/index.php/GRUB_FreeBSD

root@gate:~# cat /boot/grub/menu.lst 
default saved
timeout 10

title Windows NT/2000/XP (loader)
root (hd0,0)
savedefault
makeactive
chainloader +1

title  FreeBSD
root (hd0,1,a)
kernel /boot/loader
savedefault
makeactive

title Ubuntu 8.04, kernel 2.6.24-16-server
root (hd0,2)
kernel /boot/vmlinuz-2.6.24-16-server root=UUID=2ed7a5de-39dd-41aa-975b-f5eb150a084d ro quiet splash
initrd /boot/initrd.img-2.6.24-16-server
savedefault
makeactive

# grub-set-default 1