[CentOS] updating without rebooting

> Hi all,
> I'm curious. If I do yum update (which include kernel update) but don't reboot.
> Is it OK? I mean apart of the kernel, other things like services, we
> don't have to reboot if we don't have the chance to do it (postponing
> to some other date), right?

On the topic of updating the kernel w/o rebooting, there is this:

   http://www.ksplice.com/

I've heard of it, but never used it. Curious to hear other people's experiences...

Cheers

Steve