sorry for the earlier mail..
the "redhat-config-packages" GUI tool is used to add/remove programs contained in the Redhat CDs. it cannot be used to add any other rpm files..
sorry again.. in the earlier versions of redhat there used to be a glint.. but i am not sure of any other GUI tool..
for me, atleast, rpm is the best... and i like to have command line interfaces rather than the GUI tools..