Recently xguest had the GDM requirement dropped (
http://koji.fedoraproject.org/koji/packageinfo?packageID=5478 ).
It's on updates-testing for sure (might be on updates already).
I installed it here (running lightdm) but it fails to login (I have Xfce
and i3 and it fails similarly with both).
I was (am) about to ask in lightdm's mailing list but I suspect that
xguest might not be working with sessions other than GNOME.
It didn't work a while back when I had an installation with GDM and
there's a bug report for it not working with Xfce in F16 (earlier version).
So could any Xfce user that's using F17/GDM confirm if xguest works for you?
Note that it requires selinux in enforcing mode.
Thanks.
* on a side note, lightdm.conf hints on a future built-in guest account
support, but I intend to ask about it on their mailing list.