Well, here is the way *I* partition my disk, why and how:
http://yves.gablin.club.fr/pc/linux....fig/partitions
But if you installed RHEL, then probably it is for a company server, else you'd probably have chosen Mandriva (was: Mandrake) or Fedora instead. Anyway, if it is for a company server, then *don't* do as I do, because such servers are more secure with more partitions (I explain why on my page).
Yves.