after a fresh install of RH5.2 (workstation) I tried to install gnome from the corresponding powertools distribution. glint and rpm report a dependency error. "xscreensaver" was missing. I performed a 'grep -l xscreensaver' on the entire i386 directory. the only file the the text appeared in was a gnome-core file.
There is an xscreensaver RPM in RedHat 5.2: ftp://ftp.redhat.com/redhat/redhat-5.2/i386/RedHat/RPMS/xscreensaver-2.34-1.i386.rpm