Does Red Hat Enterprise Linux 3 come with a 'drag-and-drop' GUI program to create and burn data CDs?

Yes. Assuming the nautilus-cd-burner> RPM is installed and a CD recorder the system recognizes, the Nautilus file manager in the GNOME desktop environment has a built-in GUI interface for burning CDs.

Warning: This utility should NOT be used for burning ISO images to disc - this is more of an authoring type of utility, where data files and folders can be...