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Blecch, I keep getting nailed by this whenever I juggle around my external or removable hard-drives that have Fedora Linux loaded on them.  These are the "magic three" that convince Linux to recognize LVM-allocated partitions on removable disks.  Perform these commands as root:

lvm vgscan
lvm vgchange -ay
lvm lvscan

Thanks to the LVM2 FAQ for providing a comprehensive document, but I really only need these commands to be on my way.  This is posted mostly for my own convenience and reference, but I'm sure there are others out there who could use the quick answer.

The first two should be enough to activate the partitions, but I added the third so you can see what's actually there.  These LVM-allocated partitions should be available as devices under /dev/mapper.