I did exactly that last night. Problem is, the logical volume isn't mounting to to /home, and I'm not sure why. There's an entry in /etc/fstab, which was generated by the partitioner to take care of the mount, and it looks correct. However, it appears that despite this entry, /home is still mounted to the root filesystem instead of the logical volume. I confirmed this by ripping a CD to the server and watching the used space on the root filesystem increase.
I'm tempted just to create one huge logical volume with both disks and put all of the filesystems on it, not just /home. Any thoughts on whether this would be OK? It would certainly accomplish what I want...