[Fedora-xen] Basic FC5t3 Xen questions

Hey guys, I'm trying to try out xen on FC5t3 on x86_64, and have some basic install questions. The FC5 Xen quickstart mentions that I can use xenguest-install.py to install guest domains. That's cool, but it seems that: 1. it really wants to use file-backed domains. I want to use LVM- backed domains. 2. it requires an install path to something. What is that a path to? These appear to be such basic questions that the documentation or mailing lists don't answer them...... yet.