[CentOS] Any compelling reasons to upgrade to 5

On 3/26/07, Kanwar Ranbir Sandhu <m3freak at thesandhufamily.ca> wrote:
>
> It's not the full Xen - just a xenified kernel that will allow CentOS
> 4.5 to run seamlessly as a domU on CentOS 5.

Which version of Xen is in RH5 then?  I read that Xen 3.0 can run
unmodified linux kernels ... is a modified 4.5 kernel *required* or
just better-performing?