Originally Posted by rayfinkle
I can get the el6 rpm but I am also not sure if it is possible/smart to install a RHEL6 rpm on a RHEL5 box.
Not smart, don't do it. If it works, it's an anomaly. Anything with substantial dependencies will likely 1) not work; and/or 2) cause problems on your system.
I did a quick 'net search on gnome-disk-utility, and I see that it's available for several Debian-based systems. What problems do you need to solve with that utility? There may be something that is included with RHEL's RHN (or perhaps in EPEL) that can do it for you just as well.