Yum question (and maybe a Xen one too)

[Tony Jones]

I was using yum to track rawhide (mostly for Xen). I was snoozing and didn't
realise that FC4 had been released (duh) and my last yum upgrade sucked down 
a bunch of FC5 stuff.

Is there any way to back this out and get yum to upgrade me onto the FC4 path
or do I have to just go and install FC4 and then go back to yum?

Curious, What is the status of Xen is for FC5?  I noticed there was no Xen
kernel for the latest kernel-2.6.11-1.1381_FC5 and I don't see any Xen
symbols in it's system.map

Thanks