Jaunty comes with 2 useful tools to setup LVM. KVPM is a KDE based tool, but works fine in gnome. System-config-lvm is gnome based tool that also works well is KDE. KVPM was easier to use. Both tools still require the creation of the lvm partitions before using the tools.
KVPM Disk view
KVPM volume group view
System-config-lvm main view
