I found this useful when trying to do some recovery work on my computer which uses dm-crypt for full disk encryption. The following was done using the Ubuntu Maverick (10.10) livecd.
Mount the encrypted partition
root@ubuntu:/home/ubuntu# sudo cryptsetup luksOpen /dev/sda4 data
Enter passphrase for /dev/sda4:
root@ubuntu:/home/ubuntu# ls /dev/mapper
control data
Mount the logical volume
root@ubuntu:/home/ubuntu# aptitude install lvm2
root@ubuntu:/home/ubuntu# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg0" using metadata type lvm2
root@ubuntu:/home/ubuntu# vgchange -ay vg0
2 logical volume(s) in volume group "vg0" now active
root@ubuntu:/home/ubuntu# mkdir /mnt/tmp
root@ubuntu:/home/ubuntu# sudo mount /dev/vg0/root /mnt/tmp
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