rpm -qd lvm — This command shows all the documentation available from the lvm package, including man pages.

lvm help — This command shows all LVM commands available.

http://sources.redhat.com/lvm2 — LVM2 webpage, which contains an overview, link to the mailing lists, and more.

http://tldp.org/HOWTO/LVM-HOWTO/ — LVM HOWTO from the Linux Documentation Project.