Please note that partition numbering has been changed to start from 1 (in grub legacy it started from 0). --from the Grub2 Wiki
So in Grub2 drives will still be numbered starting from 0, but partitions start at 1? Those guys are spending waaaay too much time in Mistress Zeena's Dungeon.
At least they are honest - it's called Grub2 because you should have 2nd thoughts about using it.