Description of problem:
I added a PXE boot entry with the vmlinuz/initrd from the DVD image, and ran
into an error for the repomd.xml. At first I thought this was due to a bad media mounted on the PXE server, but turns out to be more subtle.

It was looking for the repo for "updates testing", and since I had the machine to upgrade cross connected to my PXE server, it had no uplink to the net, and so no updates-testing repo was available. I worked around this by supplying it the same URL as I used for the base repo on the http server on the PXE box

Version-Release number of selected component (if applicable):
This was booting the Fedora 15 TC1 beta 


Steps to Reproduce:
1.PXE install without an internet uplink


Additional info:

As a side note, I also got confused at first by my PXE server url not working. Turned out to be the option "is mirror url" was enabled. This was not very obvious from the GUI at all (just like the 2nd time I hit this on the updates-testing repo it was not obvious)

To address this main issue, I think "edit" button should be more obvious some how and at the very least contain a "disable repo" tickbox if this is for the updates testing repo.

Other then that, kudos for a much more stable and fault forgiving without having to reboot installer.... It's a huge improvement!