Grub + raid1

Setting up GRUB:
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# grub

grub> root (hd0,0)
grub> setup (hd0)
grub> root (hd1,0)
grub> setup (hd1)

grub> quit

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/boot/grub/menu.lst
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# Boot automatically after 5 secs.
timeout 5

# By default, boot the first entry.
default 0

# Fallback to the second entry.
fallback 1

title Debian GNU/Linux, kernel 2.6.18-4-686 /dev/sda
root (hd0,0)
kernel /boot/vmlinuz-2.6.18-4-686 root=/dev/md0 ro
initrd /boot/initrd.img-2.6.18-4-686
savedefault

title Debian GNU/Linux, kernel 2.6.18-4-686 /dev/sdb
root (hd1,0)
kernel /boot/vmlinuz-2.6.18-4-686 root=/dev/md0 ro
initrd /boot/initrd.img-2.6.18-4-686
savedefault