You might check out LinuxBeginner.org and LinuxBeginner.org; the latest RedHat distro, 7.3, is what I am using, but I wouldn\'t recommend it to a new user. Since I don\'t have the really fast CPU (600MHz AMD K6-II and only 512 Megs of RAM) required to run either the KDE or Gnome environments well, I am having to configure one of the older window managers in order to get any performance at all.
If you really want to learn the SysAdmin aspects of Linux/Unix, I\'d recommend RedHat 6.2, and do a lot of stuff via the console. Embarking on a career change from nuclear engineering to Information Tecnology, I took a series of continuing education courses on Unix system analysis, Unix programming, and system administration from Ga. Tech, and played with several variants of Unix, some using System V and some using BSD as a basis. But I learned what little I know (honestly, barely enough to do simple stuff like configuration modifications, shell scripts, and recompiling the kernel) on RedHat 4.2.
Good luck!