My new PC has 256Mb of RAM. I really don't need a swap partition. Nevertheless, when I attempted to install RedHat 6.1 using the graphical installer, it wouldn't let me proceed past the disk druid without specifying a swap partition. It would be fine for the installer to display a warning if the user attempts to proceed without a swap partition. But it really shouldn't be mandatory.
This is the programmed behavior of the installer and therefore not a bug. There are a couple of ways around this little feature however. One, you can run the installer in expert mode, which will allow you to skip specifying a swap partition. The other is that you perform the install in normal mode, but just specify a 1M swap partition which you then remove from /etc/fstab as soon as you reboot the machine.