Installing Grub2 to a logical partition

Grub hates this, and will tell you in very strong words not to do it.
If you want to do it anyway, do the following:

Assume the partition you want to install onto is /dev/sdx (or /dev/hdx if not sata drive)
Make sure you have it mounted, say to: /mnt/sdx

Install grub2 with this command:

# grub-install --force --no-floppy --root-directory=/mnt/sdx /dev/sdx

This will put the grub files (grub folder) into /mnt/sdx/boot
and install grub to the boot sector of /dev/sdx

NB) Make sure you create your new grub.cfg in the /grub folder

I have never encountered any problems from doing this and have found it extremely useful.